File: configure.in

package info (click to toggle)
socat 1.7.3.2-2
  • links: PTS
  • area: main
  • in suites: buster
  • size: 3,888 kB
  • sloc: ansic: 28,032; sh: 11,782; makefile: 146
file content (2022 lines) | stat: -rw-r--r-- 66,925 bytes parent folder | download
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
dnl source: configure.in
dnl Copyright Gerhard Rieger and contributors (see file CHANGES)
dnl Published under the GNU General Public License V.2, see file COPYING

dnl Process this file with autoconf to produce a configure script.
AC_INIT(socat.c)

AC_CONFIG_HEADER(config.h)

if test -f /usr/xpg4/bin/fgrep; then
   FGREP=/usr/xpg4/bin/fgrep   # Solaris
else
   FGREP=fgrep
fi

# find out which defines gcc passes to cpp, so makedepend does not run into
# (harmless) "error architecture not supported"
AC_MSG_CHECKING(which defines needed for makedepend)
__cpp_defs=`gcc -v -E - </dev/null 2>&1 |$FGREP -e '/cpp ' -e '/cc1 '`
SYSDEFS=`aa=; for a in $__cpp_defs
	do case "$a" in -D*) aa="$aa $a";; esac; done; echo "$aa"`
AC_SUBST(SYSDEFS)
AC_MSG_RESULT($SYSDEFS)


# this must come before AC_PROG_CC
if test -z "$CFLAGS"; then
   # if CFLAGS is not set, we preset it to -O
   # with this setting, we prevent autoconf from defaulting to "-g -O2"
   export CFLAGS=-O
fi

dnl Checks for programs.
AC_PROG_INSTALL(install)
AC_PROG_CC
AC_PROG_RANLIB
AC_SUBST(AR)
AC_CHECK_PROG(AR, ar, ar, gar)
#
# we need to explicitely call this here; otherwise, with --disable-libwrap we
# fail
AC_LANG_COMPILER_REQUIRE()

if test "$GCC" = yes; then
   CFLAGS="$CFLAGS -D_GNU_SOURCE -Wall -Wno-parentheses"
   ERRONWARN="-Werror -O0"
elif test "$CC" = "clang"; then
   CFLAGS="$CFLAGS -D_GNU_SOURCE -Wall -Wno-parentheses"
   ERRONWARN="-Werror -O0"
#elif Sun Studio
#   ERRONWARN="-errwarn"
else
   ERRONWARN=
fi
export CFLAGS


dnl Checks for header files.
AC_HEADER_STDC
AC_CHECK_HEADERS(stdbool.h)
AC_CHECK_HEADERS(inttypes.h)
AC_HEADER_SYS_WAIT
AC_CHECK_HEADERS(fcntl.h limits.h strings.h sys/param.h sys/ioctl.h sys/time.h syslog.h unistd.h)
AC_CHECK_HEADERS(pwd.h grp.h stdint.h sys/types.h poll.h sys/poll.h sys/socket.h sys/uio.h sys/stat.h netdb.h sys/un.h)
AC_CHECK_HEADERS(pty.h)
AC_CHECK_HEADERS(netinet/in.h netinet/in_systm.h)
AC_CHECK_HEADERS(netinet/ip.h, [], [], [AC_INCLUDES_DEFAULT
	#if HAVE_NETINET_IN_H && HAVE_NETINET_IN_SYSTM_H
	#include <netinet/in.h>
	#include <netinet/in_systm.h>
	#endif])	# Solaris prerequisites for netinet/ip.h
AC_CHECK_HEADERS(netinet/tcp.h)
AC_CHECK_HEADER(net/if.h, AC_DEFINE(HAVE_NET_IF_H), [], [AC_INCLUDES_DEFAULT
	#if HAVE_SYS_SOCKET_H
	#include <sys/socket.h>
	#endif])	# Mac OS X requires including sys/socket.h
AC_CHECK_HEADERS(arpa/nameser.h)

AC_HEADER_RESOLV()

AC_CHECK_HEADERS(termios.h linux/if_tun.h)
AC_CHECK_HEADERS(net/if_dl.h)
AC_CHECK_HEADERS(linux/types.h)
AC_CHECK_HEADER(linux/errqueue.h, AC_DEFINE(HAVE_LINUX_ERRQUEUE_H), [], [#include <sys/time.h>
#include <linux/types.h>])
AC_CHECK_HEADERS(sys/utsname.h sys/select.h sys/file.h)
AC_CHECK_HEADERS(util.h bsd/libutil.h libutil.h sys/stropts.h regex.h)
AC_CHECK_HEADERS(linux/fs.h linux/ext2_fs.h)

dnl Checks for setgrent, getgrent and endgrent.
AC_CHECK_FUNCS(setgrent getgrent endgrent)
dnl Checks for getgrouplist() /* BSD */
AC_CHECK_FUNCS(getgrouplist)
AC_CHECK_FUNCS(cfmakeraw)

dnl Link libresolv if necessary (for Mac OS X)
AC_SEARCH_LIBS([res_9_init], [resolv])


dnl Check for extra socket library (for Solaris)
AC_CHECK_FUNC(hstrerror,  , AC_CHECK_LIB(resolv, hstrerror, [LIBS="$LIBS -lresolv"; AC_DEFINE(HAVE_HSTRERROR)]))
AC_CHECK_FUNC(gethostent, , AC_CHECK_LIB(nsl, gethostent))
AC_CHECK_FUNC(setsockopt, , AC_CHECK_LIB(socket, setsockopt))

dnl Check for function prototype and in lib
dnl arg1: function name
dnl arg2: required include files beyond sysincludes.h
define(AC_CHECK_PROTOTYPE_LIB,[
AC_MSG_CHECKING(for $1 prototype)
AC_CACHE_VAL(sc_cv_have_prototype_lib_$1,
[CFLAGS1="$CFLAGS"; CFLAGS="$ERRONWARN -Wall $CFLAGS1";
 AC_TRY_LINK([#include "sysincludes.h"
$2],[return(&$1==(void *)&$1);],
 [sc_cv_have_prototype_lib_$1=yes],
 [sc_cv_have_prototype_lib_$1=no]);
 CFLAGS="$CFLAGS1"])
if test $sc_cv_have_prototype_lib_$1 = yes; then
   AC_DEFINE(HAVE_PROTOTYPE_LIB_$1)
fi
AC_MSG_RESULT($sc_cv_have_prototype_lib_$1)
])


dnl Check for hstrerror prototype
AC_MSG_CHECKING(for hstrerror prototype)
AC_CACHE_VAL(sc_cv_have_prototype_hstrerror,
[CFLAGS1="$CFLAGS"; CFLAGS="$ERRONWARN $(echo "$CFLAGS1" | sed -e 's@-Wall@@g')";
 AC_TRY_COMPILE([#include <netdb.h>],[hstrerror();],
 [sc_cv_have_prototype_hstrerror=no],
 [sc_cv_have_prototype_hstrerror=yes]);
 CFLAGS="$CFLAGS1"])
if test $sc_cv_have_prototype_hstrerror = yes; then
   AC_DEFINE(HAVE_PROTOTYPE_HSTRERROR)
fi
AC_MSG_RESULT($sc_cv_have_prototype_hstrerror)


AC_MSG_CHECKING(whether to include help)
AC_ARG_ENABLE(help, [  --disable-help          disable help],
	      [case "$enableval" in
	       no) AC_MSG_RESULT(no);;
	       *) AC_DEFINE(WITH_HELP) AC_MSG_RESULT(yes);;
	       esac],
	       [AC_DEFINE(WITH_HELP) AC_MSG_RESULT(yes)])

AC_MSG_CHECKING(whether to include STDIO support)
AC_ARG_ENABLE(stdio, [  --disable-stdio         disable STDIO support],
	      [case "$enableval" in
	       no) AC_MSG_RESULT(no);;
	       *) AC_DEFINE(WITH_STDIO) AC_MSG_RESULT(yes);;
	       esac],
	       [AC_DEFINE(WITH_STDIO) AC_MSG_RESULT(yes)])

AC_MSG_CHECKING(whether to include FD-number support)
AC_ARG_ENABLE(fdnum, [  --disable-fdnum         disable FD-number support],
	      [case "$enableval" in
	       no) AC_MSG_RESULT(no);;
	       *) AC_DEFINE(WITH_FDNUM) AC_MSG_RESULT(yes);;
	       esac],
	       [AC_DEFINE(WITH_FDNUM) AC_MSG_RESULT(yes)])

AC_MSG_CHECKING(whether to include direct file support)
AC_ARG_ENABLE(file, [  --disable-file          disable direct file support],
	      [case "$enableval" in
	       no) AC_MSG_RESULT(no);;
	       *) AC_DEFINE(WITH_FILE) AC_MSG_RESULT(yes);;
	       esac],
	       [AC_DEFINE(WITH_FILE) AC_MSG_RESULT(yes)])

AC_MSG_CHECKING(whether to include direct create support)
AC_ARG_ENABLE(creat, [  --disable-creat         disable direct create support],
	      [case "$enableval" in
	       no) AC_MSG_RESULT(no);;
	       *) AC_DEFINE(WITH_CREAT) AC_MSG_RESULT(yes);;
	       esac],
	       [AC_DEFINE(WITH_CREAT) AC_MSG_RESULT(yes)])

AC_MSG_CHECKING(whether to include gopen support)
AC_ARG_ENABLE(gopen, [  --disable-gopen         disable open for UNIX socket support],
	      [case "$enableval" in
	       no) AC_MSG_RESULT(no);;
	       *) AC_DEFINE(WITH_GOPEN) AC_MSG_RESULT(yes);;
	       esac],
	       [AC_DEFINE(WITH_GOPEN) AC_MSG_RESULT(yes)])

AC_MSG_CHECKING(whether to include explicit pipe support)
AC_ARG_ENABLE(pipe, [  --disable-pipe          disable pipe support],
	      [case "$enableval" in
	       no) AC_MSG_RESULT(no);;
	       *) AC_DEFINE(WITH_PIPE) AC_MSG_RESULT(yes);;
	       esac],
	       [AC_DEFINE(WITH_PIPE) AC_MSG_RESULT(yes)])

AC_MSG_CHECKING(whether to include explicit termios support)
AC_ARG_ENABLE(termios, [  --disable-termios       disable termios support],
	      [case "$enableval" in
	       no) AC_MSG_RESULT(no);;
	       *) AC_DEFINE(WITH_TERMIOS) AC_MSG_RESULT(yes);;
	       esac],
	       [AC_DEFINE(WITH_TERMIOS) AC_MSG_RESULT(yes)])

AC_MSG_CHECKING(whether to include UNIX socket support)
AC_ARG_ENABLE(unix, [  --disable-unix          disable UNIX domain socket support],
	      [case "$enableval" in
	       no) AC_MSG_RESULT(no);;
	       *) AC_DEFINE(WITH_UNIX) AC_MSG_RESULT(yes);;
	       esac],
	       [AC_DEFINE(WITH_UNIX) AC_MSG_RESULT(yes)])

AC_MSG_CHECKING(whether to include abstract UNIX socket support)
AC_ARG_ENABLE(abstract_unixsocket, [  --disable-abstract-unixsocket   disable abstract UNIX domain socket support],
	      [case "$enableval" in
	       no) AC_MSG_RESULT(no);;
	       *) AC_DEFINE(WITH_ABSTRACT_UNIXSOCKET) AC_MSG_RESULT(yes);;
	       esac],
	      [ case "`uname`" in
	        Linux)
		    AC_DEFINE(WITH_ABSTRACT_UNIXSOCKET) AC_MSG_RESULT(yes);;
		*)
		    AC_MSG_RESULT(no);;
		esac])

AC_MSG_CHECKING(whether to include IPv4 support)
AC_ARG_ENABLE(ip4, [  --disable-ip4           disable IPv4 support],
	      [case "$enableval" in
	       no) AC_MSG_RESULT(no);;
	       *) AC_DEFINE(WITH_IP4) AC_MSG_RESULT(yes);;
	       esac],
	       [AC_DEFINE(WITH_IP4) AC_MSG_RESULT(yes)])

AC_MSG_CHECKING(whether to include IPv6 support)
AC_ARG_ENABLE(ip6, [  --disable-ip6           disable IPv6 support],
	      [case "$enableval" in
	       no) AC_MSG_RESULT(no); WITH_IP6= ;;
	       *) AC_MSG_RESULT(yes); WITH_IP6=1 ;;
	       esac],
	      [ AC_MSG_RESULT(yes);  WITH_IP6=1 ])
if test "$WITH_IP6"; then
  AC_CHECK_HEADERS([netinet/ip6.h],
    [AC_DEFINE(HAVE_NETINET_IP6_H) AC_DEFINE(WITH_IP6)],
    [AC_MSG_WARN([include file netinet/ip6.h not found, disabling IP6])],
    [AC_INCLUDES_DEFAULT
     #ifdef HAVE_NETINET_IN_H
     # include <netinet/in.h>
     #endif])
  AC_CHECK_HEADERS(netinet6/in6.h)	# found on OpenBSD and Lion, used for IPV6_*

AC_MSG_CHECKING(if __APPLE_USE_RFC_2292 is helpful)
AC_CACHE_VAL(ac_cv_apple_use_rfc_2292,
 [AC_TRY_COMPILE(,[#ifndef IPV6_HOPOPTS
  murks;
#endif],
 [ac_cv_apple_use_rfc_2292=no],
 [AC_TRY_COMPILE([#define __APPLE_USE_RFC_2292],
 [#ifndef IPV6_HOPOPTS
  murks;
#endif],
   [ac_cv_apple_use_rfc_2292=yes],
   [ac_cv_apple_use_rfc_2292=no]
 )]
)])
if test "$ac_cv_apple_use_rfc_2292" = yes; then
  AC_DEFINE(__APPLE_USE_RFC_2292)
fi
AC_MSG_RESULT($ac_cv_apple_use_rfc_2292)

fi

AC_MSG_CHECKING(whether to include raw IP support)
AC_ARG_ENABLE(rawip, [  --disable-rawip         disable raw IP support],
	      [case "$enableval" in
	       no) AC_MSG_RESULT(no);;
	       *) AC_DEFINE(WITH_RAWIP) AC_MSG_RESULT(yes);;
	       esac],
	       [AC_DEFINE(WITH_RAWIP) AC_MSG_RESULT(yes)])

AC_MSG_CHECKING(whether to include generic socket support)
AC_ARG_ENABLE(genericsocket, [  --disable-genericsocket disable generic socket support],
	      [case "$enableval" in
	       no) AC_MSG_RESULT(no);;
	       *) AC_DEFINE(WITH_GENERICSOCKET) AC_MSG_RESULT(yes);;
	       esac],
	       [AC_DEFINE(WITH_GENERICSOCKET) AC_MSG_RESULT(yes)])
AC_MSG_CHECKING(whether to include generic network interface support)
AC_ARG_ENABLE(interface, [  --disable-interface  disable network interface support],
	      [case "$enableval" in
	       no) AC_MSG_RESULT(no); WITH_INTERFACE= ;;
	       *) AC_MSG_RESULT(yes); WITH_INTERFACE=1 ;;
	       esac],
	       [AC_MSG_RESULT(yes);  WITH_INTERFACE=1 ])
if test "$WITH_INTERFACE"; then
  AC_CHECK_HEADER(netpacket/packet.h,
    AC_DEFINE(HAVE_NETPACKET_PACKET_H),
    [WITH_INTERFACE=;
     AC_MSG_WARN([include file netpacket/packet.h not found, disabling interface])])
fi
if test "$WITH_INTERFACE"; then
  AC_CHECK_HEADER(netinet/if_ether.h,
    AC_DEFINE(HAVE_NETINET_IF_ETHER_H),
    [WITH_INTERFACE=;
     AC_MSG_WARN([include file netinet/if_ether.h not found, disabling interface])],
     [AC_INCLUDES_DEFAULT
     #if HAVE_NET_IF_H && HAVE_NETINET_IN_H
     #include <net/if.h>
     #include <netinet/in.h>
     #endif])
fi
if test "$WITH_INTERFACE"; then
   AC_DEFINE(WITH_INTERFACE)
fi

AC_MSG_CHECKING(whether to include TCP support)
AC_ARG_ENABLE(tcp, [  --disable-tcp           disable TCP support],
	      [case "$enableval" in
	       no) AC_MSG_RESULT(no);;
	       *) AC_DEFINE(WITH_TCP) AC_MSG_RESULT(yes);;
	       esac],
	       [AC_DEFINE(WITH_TCP) AC_MSG_RESULT(yes)])

AC_MSG_CHECKING(whether to include UDP support)
AC_ARG_ENABLE(udp, [  --disable-udp           disable UDP support],
	      [case "$enableval" in
	       no) AC_MSG_RESULT(no);;
	       *) AC_DEFINE(WITH_UDP) AC_MSG_RESULT(yes);;
	       esac],
	       [AC_DEFINE(WITH_UDP) AC_MSG_RESULT(yes)])

AC_MSG_CHECKING(whether to include SCTP support)
AC_ARG_ENABLE(sctp, [  --disable-sctp           disable SCTP support],
	      [case "$enableval" in
	       no) AC_MSG_RESULT(no); WITH_SCTP= ;;
	       *) AC_MSG_RESULT(yes); WITH_SCTP=1 ;;
	       esac],
	       [AC_MSG_RESULT(yes);   WITH_SCTP=1 ])

if test -n "$WITH_SCTP"; then
AC_MSG_CHECKING(for IPPROTO_SCTP)
AC_CACHE_VAL(sc_cv_define_ipproto_sctp,
[AC_TRY_COMPILE([#include <sys/types.h>
#include <netinet/in.h>],
[IPPROTO_SCTP;],
[sc_cv_define_ipproto_sctp=yes],
[sc_cv_define_ipproto_sctp=no])])
AC_MSG_RESULT($sc_cv_define_ipproto_sctp)
if test $sc_cv_define_ipproto_sctp = yes; then
   AC_DEFINE(WITH_SCTP)
else
   AC_MSG_WARN([IPPROTO_SCTP undefined, disabling SCTP support])
fi
fi

AC_MSG_CHECKING(whether to include listen support)
AC_ARG_ENABLE(listen, [  --disable-listen        disable listen support],
	      [case "$enableval" in
	       no) AC_MSG_RESULT(no);;
	       *) AC_DEFINE(WITH_LISTEN) AC_MSG_RESULT(yes);;
	       esac],
	       [AC_DEFINE(WITH_LISTEN) AC_MSG_RESULT(yes)])

AC_MSG_CHECKING(whether to include socks4 support)
AC_ARG_ENABLE(socks4, [  --disable-socks4        disable socks4 support],
	      [case "$enableval" in
	       no) AC_MSG_RESULT(no);;
	       *) AC_DEFINE(WITH_SOCKS4) AC_MSG_RESULT(yes);;
	       esac],
	       [AC_DEFINE(WITH_SOCKS4) AC_MSG_RESULT(yes)])

AC_MSG_CHECKING(whether to include socks4a support)
AC_ARG_ENABLE(socks4a, [  --disable-socks4a       disable socks4a support],
	      [case "$enableval" in
	       no) AC_MSG_RESULT(no);;
	       *) AC_DEFINE(WITH_SOCKS4A) AC_MSG_RESULT(yes);;
	       esac],
	       [AC_DEFINE(WITH_SOCKS4A) AC_MSG_RESULT(yes)])

AC_MSG_CHECKING(whether to include proxy connect support)
AC_ARG_ENABLE(proxy, [  --disable-proxy         disable proxy connect support],
	      [case "$enableval" in
	       no) AC_MSG_RESULT(no);;
	       *) AC_DEFINE(WITH_PROXY) AC_MSG_RESULT(yes);;
	       esac],
	       [AC_DEFINE(WITH_PROXY) AC_MSG_RESULT(yes)])

AC_MSG_CHECKING(whether to include exec support)
AC_ARG_ENABLE(exec, [  --disable-exec          disable exec support],
	      [case "$enableval" in
	       no) AC_MSG_RESULT(no);;
	       *) AC_DEFINE(WITH_EXEC) AC_MSG_RESULT(yes);;
	       esac],
	       [AC_DEFINE(WITH_EXEC) AC_MSG_RESULT(yes)])

AC_MSG_CHECKING([whether to include system (shell) support])
AC_ARG_ENABLE(system, [  --disable-system        disable system (shell) support],
	      [case "$enableval" in
	       no) AC_MSG_RESULT(no);;
	       *) AC_DEFINE(WITH_SYSTEM) AC_MSG_RESULT(yes);;
	       esac],
	       [AC_DEFINE(WITH_SYSTEM) AC_MSG_RESULT(yes)])

AC_MSG_CHECKING(whether to include pty address support)
AC_ARG_ENABLE(pty, [  --disable-pty           disable pty support],
	      [case "$enableval" in
	       no) AC_MSG_RESULT(no);;
	       *) AC_DEFINE(WITH_PTY) AC_MSG_RESULT(yes);;
	       esac],
	       [AC_DEFINE(WITH_PTY) AC_MSG_RESULT(yes)])

AC_MSG_CHECKING(whether to include ext2 fs attributes support)
AC_ARG_ENABLE(ext2, [  --disable-ext2          disable ext2 fs attributes support],
	      [case "$enableval" in
	       no) AC_MSG_RESULT(no);;
	       *) AC_DEFINE(WITH_EXT2) AC_MSG_RESULT(yes);;
	       esac],
	       [AC_DEFINE(WITH_EXT2) AC_MSG_RESULT(yes)])

AC_MSG_CHECKING(whether to include readline support)
AC_ARG_ENABLE(readline, [  --disable-readline      disable readline support],
	      [case "$enableval" in
	       no) AC_MSG_RESULT(no); WITH_READLINE= ;;
	       *) AC_MSG_RESULT(yes); WITH_READLINE=1 ;;
	       esac],
	       [AC_MSG_RESULT(yes);   WITH_READLINE=1 ])

if test -n "$WITH_READLINE"; then
  CPPFLAGS_ORIG=$CPPFLAGS
  CFLAGS_ORIG=$CFLAGS
  LIBS_ORIG=$LIBS
  sc_usable_readline_found=
  
  for D in "" "/usr/local" "/opt/local" "/sw" "/opt/freeware" "/usr/sfw"; do    
    if test -n "$D" ; then
      CPPFLAGS="$CPPFLAGS -I$D/include"
      CFLAGS="$CFLAGS -L$D/lib"
      DLOC="in location $D"
    else
      DLOC="in default location"
    fi
    AC_MSG_CHECKING(for usable readline $DLOC)
    
    # Some systems require -lcurses, some require -lncurses.
    # Mac OS X 10.4 (and others) ships with libedit masquerading as readline,
    # but it doesn't work well with socat. It can be recognized by the absence
    # of append_history.
    
    for L in "" "-lcurses" "-lncurses"; do
      LIBS="$LIBS_ORIG -lreadline $L"
      AC_TRY_LINK(
        [ #include <stdio.h>
          #include <readline/readline.h>
          #include <readline/history.h>],
        [ readline(NULL);
          append_history(0, NULL); ],
        [ sc_usable_readline_found=1
          break ])
    done
    
    if test -n "$sc_usable_readline_found"; then
      AC_MSG_RESULT(yes)
      AC_DEFINE(HAVE_READLINE_READLINE_H,1)
      AC_DEFINE(HAVE_READLINE_HISTORY_H,1)
      AC_DEFINE(HAVE_LIBREADLINE,1)
      AC_DEFINE(WITH_READLINE,1)
      break
    else
      AC_MSG_RESULT(no)
      CPPFLAGS=$CPPFLAGS_ORIG
      CFLAGS=$CFLAGS_ORIG
      LIBS=$LIBS_ORIG
    fi
  done
  
  if test -z "$sc_usable_readline_found"; then
    AC_MSG_WARN([no suitable version of readline found; perhaps you need to install a newer version])
  fi
fi

AC_MSG_CHECKING(whether to include openssl support)
AC_ARG_ENABLE(openssl, [  --disable-openssl       disable OpenSSL support],
  [ case "$enableval" in
    no) AC_MSG_RESULT(no); WITH_OPENSSL= ;;
    *) AC_MSG_RESULT(yes); WITH_OPENSSL=1 ;;
   esac],
   [ AC_MSG_RESULT(yes);   WITH_OPENSSL=1 ])
#
if test -n "$WITH_OPENSSL"; then
  AC_MSG_NOTICE(checking for components of OpenSSL)
  # first, we need to find the include file <openssl/ssl.h>
  AC_CACHE_VAL(sc_cv_have_openssl_ssl_h,
    [AC_TRY_COMPILE([#include <openssl/ssl.h>],[;],
      [sc_cv_have_openssl_ssl_h=yes; OPENSSL_ROOT=""; ],
      [sc_cv_have_openssl_ssl_h=no
       for D in "/sw" "/usr/local" "/opt/freeware" "/usr/sfw" "/usr/local/ssl"; do
	I="$D/include"
	i="$I/openssl/ssl.h"
	if test -r "$i"; then
	  #V_INCL="$V_INCL -I$I"
	  CPPFLAGS="$CPPFLAGS -I$I"
	  AC_MSG_NOTICE(found $i)
	  sc_cv_have_openssl_ssl_h=yes; OPENSSL_ROOT="$D"
	  break;
	fi
      done])
  ])
  if test "$sc_cv_have_openssl_ssl_h" = "yes"; then
    AC_DEFINE(HAVE_OPENSSL_SSL_H)
  fi
  AC_MSG_NOTICE(checked for openssl/ssl.h... $sc_cv_have_openssl_ssl_h)
fi	# end checking for openssl/ssl.h
#
if test -n "$WITH_OPENSSL" -a "$sc_cv_have_openssl_ssl_h" = 'yes'; then
  # next, we search for the openssl library (libssl.*)
  # interesting: Linux only requires -lssl, FreeBSD requires -lssl -lcrypto
  # Note, version OpenSSL 0.9.7j requires -lcrypto even on Linux.
  AC_MSG_CHECKING(for libssl)
  AC_CACHE_VAL(sc_cv_have_libssl,
    [ LIBS0="$LIBS"
      if test -n "$OPENSSL_ROOT"; then
	L="$OPENSSL_ROOT/lib"; LIBS="$LIBS -L$L -lssl"
      else
	LIBS="$LIBS -lssl"
      fi
      AC_TRY_LINK([#include <openssl/ssl.h>],
	[SSL_library_init();ERR_error_string()],
	[sc_cv_have_libssl='yes'],
	[ LIBS="$LIBS -lcrypto"
	  AC_TRY_LINK([#include <openssl/ssl.h>],
	  [SSL_library_init()],
	  [sc_cv_have_libssl='yes'],
	  [sc_cv_have_libssl='no'])
        ])
      if test "$sc_cv_have_libssl" != 'yes'; then
	LIBS="$LIBS0"
      fi
    ]
  )
  if test "$sc_cv_have_libssl" = 'yes'; then
    AC_DEFINE(HAVE_LIBSSL)
  fi
  AC_MSG_RESULT($sc_cv_have_libssl)
fi
#
#    # a possible location for openssl (on Sourceforge/Solaris)
#    AC_CHECK_FILE(/usr/local/ssl/lib, LIBS="$LIBS -L/usr/local/ssl/lib/")
#    # sometimes on Solaris:
#    AC_CHECK_FILE(/pkgs/lib, LIBS="$LIBS -L/pkgs/lib/")
#    # for AIX 5.1 with Linux toolbox:
#    AC_CHECK_FILE(/opt/freeware/lib, LIBS="$LIBS -L/opt/freeware/lib/")
#
#    AC_CHECK_LIB(crypto, main)
#    AC_CHECK_LIB(ssl, main)
#
#    # MacOSX has openssl includes in another directory
#    if test -d /sw/include/; then
#	V_INCL="$V_INCL -I/sw/include"
#    # and Solaris at sourceforge here:
#    elif test -d /usr/local/ssl/include/; then
#	V_INCL="$V_INCL -I/usr/local/ssl/include"
#    # and AIX 5.1 with Linux toolbox:
#    elif test -d /opt/freeware/include; then
#	V_INCL="$V_INCL -I/opt/freeware/include"
#    fi
#fi
if test -n "$WITH_OPENSSL"; then
  if test "$sc_cv_have_openssl_ssl_h" = "yes" -a "$sc_cv_have_libssl" = "yes"; then
    AC_DEFINE(WITH_OPENSSL)
  else
    AC_MSG_WARN([not all components of OpenSSL found, disabling it]);
  fi
fi

# check for fips support
AC_MSG_CHECKING(whether to include openssl fips support)
AC_ARG_ENABLE(fips, [  --enable-fips          enable OpenSSL FIPS support],
  [ case "$enableval" in
    yes) AC_MSG_RESULT(yes); WITH_FIPS=1 ;;
    *) AC_MSG_RESULT(no); WITH_FIPS= ;;
   esac],
   [ AC_MSG_RESULT(no);   WITH_FIPS= ])

if test -n "$WITH_FIPS"; then
  if test -n "$WITH_OPENSSL"; then
    AC_CHECK_PROG(HAVE_FIPSLD, fipsld, 1)
    if test "$sc_cv_have_openssl_ssl_h" != "yes" -o "$sc_cv_have_libssl" != "yes" -o ! "$HAVE_FIPSLD";
 then
      AC_MSG_WARN([not all components of OpenSSL found, disabling FIPS]);
      WITH_FIPS=
    fi
  else
    AC_MSG_WARN([must enable OpenSSL to enable FIPS; use --enable-openssl]);
  fi
fi

if test -n "$WITH_FIPS"; then
  AC_MSG_CHECKING(for components of OpenSSL FIPS)
  # first, we need to find the include file <openssl/fips.h>
  AC_CACHE_VAL(sc_cv_have_openssl_fips_h,
    [AC_TRY_COMPILE([#define OPENSSL_FIPS
#include <stddef.h>
#include <openssl/fips.h>],[;],
      [sc_cv_have_openssl_fips_h=yes; ],
      [sv_cv_have_openssl_fips_h=no
        if test -n "$OPENSSL_ROOT"; then
          I="$OPENSSL_ROOT/include"
          i="$I/openssl/fips.h"
          if test -r "$i"; then
            AC_MSG_NOTICE(found $i)
            sc_cv_have_openssl_fips_h=yes;
          fi
        fi
      ]
    )]
  )
  if test "$sv_cv_have_openssl_fips_h" = "yes"; then
    AC_DEFINE(HAVE_OPENSSL_FIPS_H)
  fi
  AC_MSG_NOTICE(checked for openssl/fips.h... $sc_cv_have_openssl_ssl_h)
fi

if test -n "$WITH_FIPS" -a "$sc_cv_have_openssl_fips_h" = 'yes'; then
  # check for the libcrypto library with fips support
  AC_MSG_CHECKING(for libcrypto with FIPS support)
  AC_CACHE_VAL(sc_cv_have_libcrypto,
    [ LIBS0="$LIBS"
      echo $LIBS | grep -q "\-lcrypto"
      if test $? -ne 0; then
        if test -n "$OPENSSL_ROOT"; then
          L="$OPENSSL_ROOT/lib"; LIBS="$LIBS -L$L -lcrypto"
        else
          LIBS="$LIBS -lcrypto"
        fi
      fi
      AC_TRY_LINK([#define OPENSSL_FIPS
#include <openssl/ssl.h>
#include <openssl/fips.h>],
        [int res = FIPS_mode_set(1);],
        [sc_cv_have_libcrypto='yes'],
        [sc_cv_have_libcrypto='no']
      )
      if test "$sc_cv_have_libcrypto" != 'yes'; then
        LIBS="$LIBS0"
      fi
    ]
  )
  if test "$sc_cv_have_libcrypto" = 'yes'; then
    AC_DEFINE(HAVE_LIBCRYPTO)
  fi
  AC_MSG_RESULT($sc_cv_have_libcrypto)
fi

if test -n "$WITH_FIPS"; then
  if test "$sc_cv_have_openssl_fips_h" = 'yes' -a "$sc_cv_have_libcrypto" = 'yes'; then
    AC_DEFINE(WITH_FIPS)
    AC_DEFINE(OPENSSL_FIPS)
  else
    AC_MSG_WARN([not all components of OpenSSL FIPS found, disabling it]);
  fi
fi

AC_MSG_CHECKING(whether to include tun/tap address support)
AC_ARG_ENABLE(tun, [  --disable-tun           disable TUN/TAP support],
	      [case "$enableval" in
	       no) AC_MSG_RESULT(no);  WITH_TUN= ;;
	       *)  AC_MSG_RESULT(yes); WITH_TUN=1 ;;
	       esac],
	       [AC_MSG_RESULT(yes);    WITH_TUN=1 ])

#
if ! test "$ac_cv_header_linux_if_tun_h" = 'yes'; then
  AC_MSG_WARN(include file linux/if_tun.h not found, disabling TUN)
  WITH_TUN=
fi
#
if test -n "$WITH_TUN"; then
  AC_DEFINE(WITH_TUN)
fi

AC_MSG_CHECKING(whether to include system call tracing)
AC_ARG_ENABLE(sycls, [  --disable-sycls         disable system call tracing],
	      [case "$enableval" in
	       no) SYCLS=""; SSLCLS=""; AC_MSG_RESULT(no);;
	       *) AC_DEFINE(WITH_SYCLS)
		 SYCLS="sycls.c"; SSLCLS="sslcls.c"; AC_MSG_RESULT(yes);;
	       esac],
	       [AC_DEFINE(WITH_SYCLS)
		 SYCLS="sycls.c"; SSLCLS="sslcls.c"; AC_MSG_RESULT(yes)])
AC_SUBST(SYCLS)
AC_SUBST(SSLCLS)

AC_MSG_CHECKING(whether to include file descriptor analyzer)
AC_ARG_ENABLE(filan, [  --disable-filan         disable file descriptor analyzer],
	      [case "$enableval" in
	       no) FILAN=""; AC_MSG_RESULT(no);;
	       *) AC_DEFINE(WITH_FILAN) FILAN="filan.c"; AC_MSG_RESULT(yes);;
	       esac],
	       [AC_DEFINE(WITH_FILAN) FILAN="filan.c"; AC_MSG_RESULT(yes)])
AC_SUBST(FILAN)

AC_MSG_CHECKING(whether to include retry support)
AC_ARG_ENABLE(retry, [  --disable-retry         disable retry support],
	      [case "$enableval" in
	       no) AC_MSG_RESULT(no);;
	       *) AC_DEFINE(WITH_RETRY) AC_MSG_RESULT(yes);;
	       esac],
	       [AC_DEFINE(WITH_RETRY) AC_MSG_RESULT(yes)])

AC_MSG_CHECKING(included message level)
AC_ARG_ENABLE(msglevel, [  --enable-msglevel=N     set max verbosity to debug,info,notice,warn,error,fatal],
	      [case "$enableval" in
	       debug) AC_DEFINE(WITH_MSGLEVEL,0) AC_MSG_RESULT(debug);;
	       info)  AC_DEFINE(WITH_MSGLEVEL,1) AC_MSG_RESULT(info);;
	       notice) AC_DEFINE(WITH_MSGLEVEL,2) AC_MSG_RESULT(notice);;
	       warn) AC_DEFINE(WITH_MSGLEVEL,3) AC_MSG_RESULT(warn);;
	       error) AC_DEFINE(WITH_MSGLEVEL,4) AC_MSG_RESULT(error);;
	       fatal) AC_DEFINE(WITH_MSGLEVEL,5) AC_MSG_RESULT(fatal);;
	       *) AC_DEFINE(WITH_MSGLEVEL,0) AC_MSG_RESULT(debug);;
	       esac],
	       [AC_DEFINE(WITH_MSGLEVEL,0) AC_MSG_RESULT(debug)])

#AC_SUBST(V_INCL)

dnl Checks for typedefs, structures, and compiler characteristics.
AC_C_CONST
AC_TYPE_UID_T
AC_TYPE_MODE_T
AC_TYPE_OFF_T
AC_TYPE_PID_T
AC_TYPE_SIZE_T
AC_STRUCT_ST_BLKSIZE
AC_STRUCT_ST_BLOCKS
AC_STRUCT_ST_RDEV
AC_HEADER_TIME

dnl Check for extra realtime library (for Solaris)
AC_CHECK_FUNC(nanosleep, AC_DEFINE(HAVE_NANOSLEEP), AC_CHECK_LIB(rt, nanosleep, [LIBS="-lrt $LIBS"; AC_DEFINE(HAVE_NANOSLEEP)]))
#AC_CHECK_FUNC(nanosleep, , AC_CHECK_LIB(rt, nanosleep))

dnl Checks for library functions.
AC_PROG_GCC_TRADITIONAL
AC_FUNC_MEMCMP
AC_TYPE_SIGNAL
AC_FUNC_STRFTIME
AC_CHECK_FUNCS(putenv select poll socket strtod strtol)
AC_CHECK_FUNCS(strtoul uname getpgid getsid getaddrinfo)
AC_CHECK_FUNCS(setgroups inet_aton)
AC_CHECK_FUNCS()

AC_CHECK_FUNCS(grantpt unlockpt)

# GR AC_CHECK_FUNCS only checks linking, not prototype. This may lead to implicit
# function declarations and to SIGSEGV on systems with 32bit int and 64bit pointer

###################################
# check for prototype and existence of functions that return a pointer
# defines in config.h: HAVE_PROTOTYPE_LIB_$1
AC_CHECK_PROTOTYPE_LIB(strdup)
AC_CHECK_PROTOTYPE_LIB(strerror)
AC_CHECK_PROTOTYPE_LIB(strstr)
AC_CHECK_PROTOTYPE_LIB(getipnodebyname)
AC_CHECK_PROTOTYPE_LIB(memrchr)
AC_CHECK_PROTOTYPE_LIB(if_indextoname)
AC_CHECK_PROTOTYPE_LIB(ptsname)


AC_MSG_CHECKING(for long long)
AC_CACHE_VAL(sc_cv_type_longlong,
[AC_TRY_COMPILE([],[long long s;],
[sc_cv_type_longlong=yes],
[sc_cv_type_longlong=no])])
if test $sc_cv_type_longlong = yes; then
   AC_DEFINE(HAVE_TYPE_LONGLONG)
fi
AC_MSG_RESULT($sc_cv_type_longlong)

AC_CHECK_TYPE(sig_atomic_t,AC_DEFINE(HAVE_TYPE_SIG_ATOMIC_T),,[#include "sysincludes.h"])

AC_MSG_CHECKING(for bool)
AC_CACHE_VAL(sc_cv_type_bool,
[AC_TRY_COMPILE([#ifdef HAVE_STDBOOL_H
   #include <stdbool.h>
   #endif],
[bool b;],
[sc_cv_type_bool=yes],
[sc_cv_type_bool=no])])
if test $sc_cv_type_bool = yes; then
   AC_DEFINE(HAVE_TYPE_BOOL)
fi
AC_MSG_RESULT($sc_cv_type_bool)

# following builtin macro does not check unistd.h and sys/socket.h where
# socklen_t might be defined
#AC_CHECK_TYPE(socklen_t, int)
#
AC_MSG_CHECKING(for socklen_t)
AC_CACHE_VAL(sc_cv_type_socklen,
[AC_TRY_COMPILE([#include <sys/types.h>
#include <sys/socket.h>
#include <unistd.h>],[socklen_t s;],
[sc_cv_type_socklen=yes],
[sc_cv_type_socklen=no])])
if test $sc_cv_type_socklen = yes; then
   AC_DEFINE(HAVE_TYPE_SOCKLEN)
fi
AC_MSG_RESULT($sc_cv_type_socklen)

AC_MSG_CHECKING(for struct stat64)
AC_CACHE_VAL(sc_cv_type_stat64,
[AC_TRY_COMPILE([#include <sys/stat.h>],[struct stat64 s;],
[sc_cv_type_stat64=yes],
[sc_cv_type_stat64=no])])
if test $sc_cv_type_stat64 = yes; then
   AC_DEFINE(HAVE_TYPE_STAT64)
fi
AC_MSG_RESULT($sc_cv_type_stat64)

AC_MSG_CHECKING(for off64_t)
AC_CACHE_VAL(sc_cv_type_off64,
[AC_TRY_COMPILE([#include <unistd.h>],[off64_t s;],
[sc_cv_type_off64=yes],
[sc_cv_type_off64=no])])
if test $sc_cv_type_off64 = yes; then
   AC_DEFINE(HAVE_TYPE_OFF64)
fi
AC_MSG_RESULT($sc_cv_type_off64)

AC_MSG_CHECKING(for sighandler_t)
AC_CACHE_VAL(sc_cv_type_sighandler,
[AC_TRY_COMPILE([#include <signal.h>],[sighandler_t s;],
[sc_cv_type_sighandler=yes],
[sc_cv_type_sighandler=no])])
if test $sc_cv_type_sighandler = yes; then
   AC_DEFINE(HAVE_TYPE_SIGHANDLER)
fi
AC_MSG_RESULT($sc_cv_type_socklen)

AC_MSG_CHECKING(for uint8_t)
AC_CACHE_VAL(sc_cv_type_uint8,
[AC_TRY_COMPILE([#include <sys/types.h>
#if HAVE_STDINT_H
#include <stdint.h>
#endif
/* Tru64 has uint8_t etc from netdb.h */
#if HAVE_NETDB_H
#include <netdb.h>
#endif
#include <unistd.h>],[uint8_t s;],
[sc_cv_type_uint8=yes],
[sc_cv_type_uint8=no])])
if test $sc_cv_type_uint8 = yes; then
   AC_DEFINE(HAVE_TYPE_UINT8)
fi
AC_MSG_RESULT($sc_cv_type_uint8)

AC_MSG_CHECKING(for uint16_t)
AC_CACHE_VAL(sc_cv_type_uint16,
[AC_TRY_COMPILE([#include <sys/types.h>
#if HAVE_STDINT_H
#include <stdint.h>
#endif
/* Tru64 has uint16_t etc from netdb.h */
#if HAVE_NETDB_H
#include <netdb.h>
#endif
#include <unistd.h>],[uint16_t s;],
[sc_cv_type_uint16=yes],
[sc_cv_type_uint16=no])])
if test $sc_cv_type_uint16 = yes; then
   AC_DEFINE(HAVE_TYPE_UINT16)
fi
AC_MSG_RESULT($sc_cv_type_uint16)

AC_MSG_CHECKING(for uint32_t)
AC_CACHE_VAL(sc_cv_type_uint32,
[AC_TRY_COMPILE([#include <sys/types.h>
#if HAVE_STDINT_H
#include <stdint.h>
#endif
/* Tru64 has uint32_t etc from netdb.h */
#if HAVE_NETDB_H
#include <netdb.h>
#endif
#include <unistd.h>],[uint32_t s;],
[sc_cv_type_uint32=yes],
[sc_cv_type_uint32=no])])
if test $sc_cv_type_uint32 = yes; then
   AC_DEFINE(HAVE_TYPE_UINT32)
fi
AC_MSG_RESULT($sc_cv_type_uint32)

AC_MSG_CHECKING(for uint64_t)
AC_CACHE_VAL(sc_cv_type_uint64,
[AC_TRY_COMPILE([#include <sys/types.h>
#if HAVE_STDINT_H
#include <stdint.h>
#endif
/* Tru64 has uint32_t etc from netdb.h */
#if HAVE_NETDB_H
#include <netdb.h>
#endif
#include <unistd.h>],[uint64_t s;],
[sc_cv_type_uint64=yes],
[sc_cv_type_uint64=no])])
if test $sc_cv_type_uint64 = yes; then
   AC_DEFINE(HAVE_TYPE_UINT64)
fi
AC_MSG_RESULT($sc_cv_type_uint64)

### AIX 4.1 needs _XOPEN_EXTENDED_SOURCE for syslog headers,
# but then gets problems with 3rd arg of getsockaddr...
#AC_MSG_CHECKING(for _XOPEN_EXTENDED_SOURCE requirement)
#CFLAGS="-Werror -Wall"
#AC_TRY_COMPILE([#include <sys/syslog.h>],
#[syslog(0," ");],
#[AC_MSG_RESULT(no)],
#[AC_MSG_RESULT(required); AC_DEFINE(_XOPEN_EXTENDED_SOURCE)])


### fds_bits

AC_MSG_CHECKING(for fdset->fds_bits)
AC_TRY_COMPILE([#include <sys/types.h>
#if HAVE_SYS_SELECT_H
#include <sys/select.h>
#endif],
[fd_set s; s.fds_bits[0]=0;],
[AC_MSG_RESULT(yes); AC_DEFINE(HAVE_FDS_BITS)],
[AC_MSG_RESULT(no);])

AC_MSG_CHECKING(for sa_family_t)
AC_CACHE_VAL(sc_cv_type_sa_family_t,
[AC_TRY_COMPILE([#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>],[sa_family_t s;],
[sc_cv_type_sa_family_t=yes],
[sc_cv_type_sa_family_t=no])])
if test $sc_cv_type_sa_family_t = yes; then
   AC_DEFINE(HAVE_TYPE_SA_FAMILY_T)
fi
AC_MSG_RESULT($sc_cv_type_sa_family_t)

AC_MSG_CHECKING(for struct sock_extended_err)
AC_CACHE_VAL(sc_cv_struct_sock_extended_err,
[AC_TRY_COMPILE([#include <linux/types.h>
#if TIME_WITH_SYS_TIME
#include <sys/time.h>
#endif
#if HAVE_LINUX_ERRQUEUE_H
#include <linux/errqueue.h>
#endif],[struct sock_extended_err s;],
[sc_cv_struct_sock_extended_err=yes],
[sc_cv_struct_sock_extended_err=no])])
if test $sc_cv_struct_sock_extended_err = yes; then
   AC_DEFINE(HAVE_STRUCT_SOCK_EXTENDED_ERR)
fi
AC_MSG_RESULT($sc_cv_struct_sock_extended_err)

AC_MSG_CHECKING(for struct sigaction.sa_sigaction)
AC_CACHE_VAL(sc_cv_struct_sigaction_sa_sigaction,
[AC_TRY_COMPILE([#include <signal.h>],[struct sigaction s;s.sa_sigaction=0;],
[sc_cv_struct_sigaction_sa_sigaction=yes],
[sc_cv_struct_sigaction_sa_sigaction=no])])
if test $sc_cv_struct_sigaction_sa_sigaction = yes; then
   AC_DEFINE(HAVE_STRUCT_SIGACTION_SA_SIGACTION)
fi
AC_MSG_RESULT($sc_cv_struct_sigaction_sa_sigaction)

### struct termios .c_ispeed
AC_MSG_CHECKING(for termios.c_ispeed)
AC_CACHE_VAL(sc_cv_termios_ispeed,
[AC_TRY_COMPILE([#include <termios.h>],
[struct termios t; t.c_ispeed=0;],
[sc_cv_termios_ispeed=yes],
[sc_cv_termios_ispeed=no])])
if test $sc_cv_termios_ispeed = yes; then
   AC_DEFINE(HAVE_TERMIOS_ISPEED)
fi
AC_MSG_RESULT($sc_cv_termios_ispeed)

if test $sc_cv_termios_ispeed = yes; then
AC_MSG_CHECKING(for offset of c_ispeed in struct termios)
LIBS1="$LIBS"; LIBS=""	# avoid libwrap allow_severity undefined
AC_CACHE_VAL(ac_cv_ispeed_offset,
 [conftestspeedoff="conftestspeedoff.out"
 AC_TRY_RUN([
  #include <errno.h>
  #include <stdlib.h>
  #include <stdio.h>
  #include <termios.h>
  #include <string.h>
  int main(){
    struct termios t;
    FILE *f;
    if ((f=fopen("$conftestspeedoff","w"))==NULL){
       fprintf(stderr,"\\"$conftestspeedoff\\": %s\n",strerror(errno)); exit(-1);
    }
    fprintf(f, "%d", ((char*)&t.c_ispeed-(char*)&t)/sizeof(speed_t));
    exit(0);
 }
 ],
 [ac_cv_ispeed_offset=`cat $conftestspeedoff`],
 [ac_cv_ispeed_offset=-1],
 [ac_cv_ispeed_offset=-1]	#!
)])
LIBS="$LIBS1"
AC_MSG_RESULT($ac_cv_ispeed_offset)
 if test $ac_cv_ispeed_offset -ge 0; then
   AC_DEFINE_UNQUOTED(ISPEED_OFFSET, $ac_cv_ispeed_offset)
 fi
fi

# there is another issue with termios: OSR requires "#define _SVID3 ..."
# for reasonable termios support. We check this situation using IMAXBEL
AC_MSG_CHECKING(if _SVID3 is helpful)
AC_CACHE_VAL(ac_cv_svid3,
 [AC_TRY_COMPILE([#include <termios.h>],
 [int i=IMAXBEL],
 [ac_cv_svid3=no],
 [AC_TRY_COMPILE([#define _SVID3 1
#include <termios.h>],
   [int i=IMAXBEL],
   [ac_cv_svid3=yes],
   [ac_cv_svid3=no]
 )]
)])
if test $ac_cv_svid3 = yes; then
  AC_DEFINE(_SVID3)
fi
AC_MSG_RESULT($ac_cv_svid3)


# Openindiana needs _XPG4_2 for CMSG stuff
AC_MSG_CHECKING(if _XPG4_2 is helpful)
AC_CACHE_VAL(ac_cv_xpg4_2,
 [AC_TRY_LINK([#include <sys/socket.h>],
 [int i=CMSG_DATA(0)],
 [ac_cv_xpg4_2=no],
 [AC_TRY_LINK([#define _XPG4_2 1
#include <sys/socket.h>],
   [int i=CMSG_DATA(0)],
   [ac_cv_xpg4_2=yes],
   [ac_cv_xpg4_2=no]
 )]
)])
if test $ac_cv_xpg4_2 = yes; then
  AC_DEFINE(_XPG4_2)
fi
AC_MSG_RESULT($ac_cv_xpg4_2)

# When on Openindiana _XPG4_2 is defined (see above)
# we also need to define __EXTENSIONS__ for basic stuff.
# Note that <sys/procset.h> is important on Openindiana
# but does not exist on Linux
if test "$ac_cv_xpg4_2" = yes; then
 AC_MSG_CHECKING(if __EXTENSIONS__ is helpful)
 AC_CACHE_VAL(ac_cv___extensions__,
  [AC_TRY_COMPILE([#include <sys/procset.h>],
  [procset_t *s=0;],
  [ac_cv___extensions__=no],
  [AC_TRY_COMPILE([#define __EXTENSIONS__ 1
#include <sys/procset.h>],
    [procset_t *s=0;],
    [ac_cv___extensions__=yes],
    [ac_cv___extensions__=no]
  )]
 )])
 if test $ac_cv___extensions__ = yes; then
   AC_DEFINE(__EXTENSIONS__)
 fi
 AC_MSG_RESULT($ac_cv___extensions__)
fi

# When on Openindiana __EXTENSIONS__ is defined (see above)
# _POSIX_PTHREAD_SEMANTICS must be defined for standard ctime_r()
if test "$ac_cv___extensions__" = yes; then
 AC_MSG_CHECKING(if _POSIX_PTHREAD_SEMANTICS is helpful)
 AC_CACHE_VAL(ac_cv__posix_pthread_semantics,
  [AC_TRY_COMPILE([#include <time.h>],
  [char *s = ctime_r(0,0);],
  [ac_cv__posix_pthread_semantics=no],
  [AC_TRY_COMPILE([#define _POSIX_PTHREAD_SEMANTICS 1
#include <time.h>],
    [char *s = ctime_r(0,0);],
    [ac_cv__posix_pthread_semantics=yes],
    [ac_cv__posix_pthread_semantics=no]
  )]
 )])
 if test $ac_cv__posix_pthread_semantics = yes; then
   AC_DEFINE(_POSIX_PTHREAD_SEMANTICS)
 fi
 AC_MSG_RESULT($ac_cv__posix_pthread_semantics)
fi

 
# struct timespec
AC_MSG_CHECKING(for struct timespec)
AC_CACHE_VAL(sc_cv_struct_timespec,
[AC_TRY_COMPILE([#include <time.h>
#if HAVE_SYS_TIME_H
#include <sys/time.h>
#endif],[struct timespec s;],
[sc_cv_struct_timespec=yes],
[sc_cv_struct_timespec=no])])
if test $sc_cv_struct_timespec = yes; then
   AC_DEFINE(HAVE_STRUCT_TIMESPEC)
fi
AC_MSG_RESULT($sc_cv_struct_timespec)


# struct linger; FreeBSD requires sys/types.h for sys/socket.h
AC_MSG_CHECKING(for struct linger)
AC_CACHE_VAL(sc_cv_struct_linger,
[AC_TRY_COMPILE([#include <sys/types.h>
#include <sys/socket.h>],[struct linger s;],
[sc_cv_struct_linger=yes],
[sc_cv_struct_linger=no])])
if test $sc_cv_struct_linger = yes; then
   AC_DEFINE(HAVE_STRUCT_LINGER)
fi
AC_MSG_RESULT($sc_cv_struct_linger)


# struct ip (for IPv4 header info)
AC_MSG_CHECKING(for struct ip)
AC_CACHE_VAL(sc_cv_struct_ip,
[AC_TRY_COMPILE([#include <netinet/ip.h>],[struct ip s;],
[sc_cv_struct_ip=yes],
[sc_cv_struct_ip=no])])
if test $sc_cv_struct_ip = yes; then
   AC_DEFINE(HAVE_STRUCT_IP)
fi
AC_MSG_RESULT($sc_cv_struct_ip)

# struct ip_mreq (for multicasting options)
AC_MSG_CHECKING(for struct ip_mreq)
AC_CACHE_VAL(sc_cv_struct_ip_mreq,
[AC_TRY_COMPILE([#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>],[struct ip_mreq s;],
[sc_cv_struct_ip_mreq=yes],
[sc_cv_struct_ip_mreq=no])])
if test $sc_cv_struct_ip_mreq = yes; then
   AC_DEFINE(HAVE_STRUCT_IP_MREQ)
fi
AC_MSG_RESULT($sc_cv_struct_ip_mreq)

# struct ip_mreqn (for multicasting options)
AC_MSG_CHECKING(for struct ip_mreqn)
AC_CACHE_VAL(sc_cv_struct_ip_mreqn,
[AC_TRY_COMPILE([#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/ip.h>],[struct ip_mreqn s;],
[sc_cv_struct_ip_mreqn=yes],
[sc_cv_struct_ip_mreqn=no])])
if test $sc_cv_struct_ip_mreqn = yes; then
   AC_DEFINE(HAVE_STRUCT_IP_MREQN)
fi
AC_MSG_RESULT($sc_cv_struct_ip_mreqn)

# struct ipv6_mreq (for multicasting options)
AC_MSG_CHECKING(for struct ipv6_mreq)
AC_CACHE_VAL(sc_cv_struct_ipv6_mreq,
[AC_TRY_COMPILE([#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>],[struct ipv6_mreq s;],
[sc_cv_struct_ipv6_mreq=yes],
[sc_cv_struct_ipv6_mreq=no])])
if test $sc_cv_struct_ipv6_mreq = yes; then
   AC_DEFINE(HAVE_STRUCT_IPV6_MREQ)
fi
AC_MSG_RESULT($sc_cv_struct_ipv6_mreq)


# struct ifreq (for network interfaces)
AC_MSG_CHECKING(for struct ifreq)
AC_CACHE_VAL(sc_cv_struct_ifreq,
[AC_TRY_COMPILE([#include <sys/types.h>
#include <sys/socket.h>
#include <net/if.h>],[struct ifreq s;],
[sc_cv_struct_ifreq=yes],
[sc_cv_struct_ifreq=no])])
if test $sc_cv_struct_ifreq = yes; then
   AC_DEFINE(HAVE_STRUCT_IFREQ)
fi
AC_MSG_RESULT($sc_cv_struct_ifreq)

# struct ifreq.ifr_index
# on most systems that have struct ifreq
AC_MSG_CHECKING(for struct ifreq.ifr_index)
AC_CACHE_VAL(sc_cv_struct_ifreq_ifr_index,
[AC_TRY_COMPILE([#include <sys/types.h>
#include <sys/socket.h>
#include <net/if.h>],
[struct ifreq ir;ir.ifr_index=0;],
[sc_cv_struct_ifreq_ifr_index=yes],
[sc_cv_struct_ifreq_ifr_index=no])])
if test $sc_cv_struct_ifreq_ifr_index = yes; then
   AC_DEFINE(HAVE_STRUCT_IFREQ_IFR_INDEX)
fi
AC_MSG_RESULT($sc_cv_struct_ifreq_ifr_index)

# struct ifreq.ifr_ifindex
# Linux has ifr_ifindex instead of ifr_index
AC_MSG_CHECKING(for struct ifreq.ifr_ifindex)
AC_CACHE_VAL(sc_cv_struct_ifreq_ifr_ifindex,
[AC_TRY_COMPILE([#include <sys/types.h>
#include <sys/socket.h>
#include <net/if.h>],
[struct ifreq ir;ir.ifr_ifindex=0;],
[sc_cv_struct_ifreq_ifr_ifindex=yes],
[sc_cv_struct_ifreq_ifr_ifindex=no])])
if test $sc_cv_struct_ifreq_ifr_ifindex = yes; then
   AC_DEFINE(HAVE_STRUCT_IFREQ_IFR_IFINDEX)
fi
AC_MSG_RESULT($sc_cv_struct_ifreq_ifr_ifindex)


# some systems have a sa_len field in struct sockaddr and we need to support it
# so we can compare sockaddrs simply with memcmp
AC_MSG_CHECKING(for struct sockaddr.sa_len)
AC_CACHE_VAL(sc_cv_struct_sockaddr_salen,
[AC_TRY_COMPILE([#include <sys/types.h>
#include <sys/socket.h>],
[struct sockaddr sa;sa.sa_len=0;],
[sc_cv_struct_sockaddr_salen=yes],
[sc_cv_struct_sockaddr_salen=no])])
if test $sc_cv_struct_sockaddr_salen = yes; then
   AC_DEFINE(HAVE_STRUCT_SOCKADDR_SALEN)
fi
AC_MSG_RESULT($sc_cv_struct_sockaddr_salen)

### IP6 sockaddr_in6

AC_MSG_CHECKING(for component names of sockaddr_in6)
AC_TRY_COMPILE([#include <sys/types.h>
#include <netinet/in.h>],
[struct sockaddr_in6 sa6;sa6.sin6_addr.s6_addr[0]=0;],
[AC_MSG_RESULT(s6_addr);
 AC_DEFINE(HAVE_IP6_SOCKADDR, 0)],
[AC_TRY_COMPILE([#include <sys/types.h>
#include <netinet/in.h>],
 [struct sockaddr_in6 sa6;sa6.sin6_addr.u6_addr.u6_addr16[0]=0;],
 [AC_MSG_RESULT(u6_addr.u6_addr16);
  AC_DEFINE(HAVE_IP6_SOCKADDR, 1)],
 [AC_TRY_COMPILE([#include <sys/types.h>
#include <netinet/in.h>],
  [struct sockaddr_in6 sa6;sa6.sin6_addr.u6_addr16[0]=0;],
  [AC_MSG_RESULT(u6_addr16); AC_DEFINE(HAVE_IP6_SOCKADDR, 2)],
  [AC_TRY_COMPILE([#include <sys/types.h>
#include <netinet/in.h>],
   [struct sockaddr_in6 sa6;sa6.sin6_addr.in6_u.u6_addr16[0]=0;],
   [AC_MSG_RESULT(in6_u.u6_addr16);
    AC_DEFINE(HAVE_IP6_SOCKADDR, 3)],
   [AC_TRY_COMPILE([#include <sys/types.h>
#include <netinet/in.h>],
    [struct sockaddr_in6 sa6;sa6.sin6_addr._S6_un._S6_u32[0]=0;],
    [AC_MSG_RESULT(_S6_un._S6_u32);
     AC_DEFINE(HAVE_IP6_SOCKADDR, 4)],
    [AC_TRY_COMPILE([#include <sys/types.h>
#include <netinet/in.h>],
     [struct sockaddr_in6 sa6;sa6.sin6_addr.__u6_addr.__u6_addr32[0]=0;],
     [AC_MSG_RESULT(__u6_addr.__u6_addr32);
      AC_DEFINE(HAVE_IP6_SOCKADDR, 5)],

    [AC_MSG_RESULT([none or unknown])]
)])])])])])

dnl Check for struct iovec
AC_MSG_CHECKING(for struct iovec)
AC_CACHE_VAL(sc_cv_struct_iovec,
[AC_TRY_COMPILE([#include <sys/uio.h>],[struct iovec s;],
[sc_cv_struct_iovec=yes],
[sc_cv_struct_iovec=no])])
if test $sc_cv_struct_iovec = yes; then
   AC_DEFINE(HAVE_STRUCT_IOVEC)
fi
AC_MSG_RESULT($sc_cv_struct_iovec)

dnl check for msg_control in struct msghdr
AC_MSG_CHECKING(for struct msghdr.msg_control)
AC_CACHE_VAL(sc_cv_struct_msghdr_msgcontrol,
[AC_TRY_COMPILE([#include <sys/types.h>
#include <sys/socket.h>],
[struct msghdr s;s.msg_control=0;],
[sc_cv_struct_msghdr_msgcontrol=yes],
[sc_cv_struct_msghdr_msgcontrol=no])])
if test $sc_cv_struct_msghdr_msgcontrol = yes; then
   AC_DEFINE(HAVE_STRUCT_MSGHDR_MSGCONTROL)
fi
AC_MSG_RESULT($sc_cv_struct_msghdr_msgcontrol)

dnl check for msg_controllen in struct msghdr
AC_MSG_CHECKING(for struct msghdr.msg_controllen)
AC_CACHE_VAL(sc_cv_struct_msghdr_msgcontrollen,
[AC_TRY_COMPILE([#include <sys/types.h>
#include <sys/socket.h>],
[struct msghdr s;s.msg_controllen=0;],
[sc_cv_struct_msghdr_msgcontrollen=yes],
[sc_cv_struct_msghdr_msgcontrollen=no])])
if test $sc_cv_struct_msghdr_msgcontrollen = yes; then
   AC_DEFINE(HAVE_STRUCT_MSGHDR_MSGCONTROLLEN)
fi
AC_MSG_RESULT($sc_cv_struct_msghdr_msgcontrollen)

dnl check for msg_flags in struct msghdr
AC_MSG_CHECKING(for struct msghdr.msgflags)
AC_CACHE_VAL(sc_cv_struct_msghdr_msgflags,
[AC_TRY_COMPILE([#include <sys/types.h>
#include <sys/socket.h>],
[struct msghdr s;s.msg_flags=0;],
[sc_cv_struct_msghdr_msgflags=yes],
[sc_cv_struct_msghdr_msgflags=no])])
if test $sc_cv_struct_msghdr_msgflags = yes; then
   AC_DEFINE(HAVE_STRUCT_MSGHDR_MSGFLAGS)
fi
AC_MSG_RESULT($sc_cv_struct_msghdr_msgflags)

dnl check for struct cmsghdr
AC_MSG_CHECKING(for struct cmsghdr)
AC_CACHE_VAL(sc_cv_struct_cmsghdr,
[AC_TRY_COMPILE([#include <sys/types.h>
#include <sys/socket.h>
#include <net/if.h>],[struct cmsghdr s;],
[sc_cv_struct_cmsghdr=yes],
[sc_cv_struct_cmsghdr=no])])
if test $sc_cv_struct_cmsghdr = yes; then
   AC_DEFINE(HAVE_STRUCT_CMSGHDR)
fi
AC_MSG_RESULT($sc_cv_struct_cmsghdr)

dnl check for struct in_pktinfo
AC_MSG_CHECKING(for struct in_pktinfo)
AC_CACHE_VAL(sc_cv_struct_in_pktinfo,
[AC_TRY_COMPILE([#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>],[struct in_pktinfo s;],
[sc_cv_struct_in_pktinfo=yes],
[sc_cv_struct_in_pktinfo=no])])
if test $sc_cv_struct_in_pktinfo = yes; then
   AC_DEFINE(HAVE_STRUCT_IN_PKTINFO)
fi
AC_MSG_RESULT($sc_cv_struct_in_pktinfo)

if test $sc_cv_struct_in_pktinfo = 'yes'; then
   dnl check for component ipi_spec_dst in struct in_pktinfo
   AC_MSG_CHECKING(for ipi_spec_dst in struct in_pktinfo)
   AC_CACHE_VAL(sc_cv_pktinfo_ipi_spec_dst,
   [AC_TRY_COMPILE([#include <sys/types.h>
   #include <sys/socket.h>
   #include <netinet/in.h>],[struct in_pktinfo s; s.ipi_spec_dst],
   [sc_cv_pktinfo_ipi_spec_dst=yes],
   [sc_cv_pktinfo_ipi_spec_dst=no])])
   if test $sc_cv_pktinfo_ipi_spec_dst = yes; then
      AC_DEFINE(HAVE_PKTINFO_IPI_SPEC_DST)
   fi
   AC_MSG_RESULT($sc_cv_pktinfo_ipi_spec_dst)
fi

dnl check for struct in6_pktinfo
AC_MSG_CHECKING(for struct in6_pktinfo)
AC_CACHE_VAL(sc_cv_struct_in6_pktinfo,
[AC_TRY_COMPILE([#include "sysincludes.h"],
[struct in6_pktinfo s;],
[sc_cv_struct_in6_pktinfo=yes],
[sc_cv_struct_in6_pktinfo=no])])
if test $sc_cv_struct_in6_pktinfo = yes; then
   AC_DEFINE(HAVE_STRUCT_IN6_PKTINFO)
fi
AC_MSG_RESULT($sc_cv_struct_in6_pktinfo)

dnl check for ip_hl in struct ip
AC_MSG_CHECKING(for struct ip.ip_hl)
AC_CACHE_VAL(sc_cv_struct_ip_ip_hl,
[AC_TRY_COMPILE([#include <sys/types.h>
#include <netinet/in_systm.h>
#include <netinet/in.h>
#include <netinet/ip.h>],
[struct ip s;s.ip_hl=0;],
[sc_cv_struct_ip_ip_hl=yes],
[sc_cv_struct_ip_ip_hl=no])])
if test $sc_cv_struct_ip_ip_hl = yes; then
   AC_DEFINE(HAVE_STRUCT_IP_IP_HL)
fi
AC_MSG_RESULT($sc_cv_struct_ip_ip_hl)


dnl Library function checks

dnl Check sigaction()
AC_CHECK_FUNC(sigaction, AC_DEFINE(HAVE_SIGACTION))

dnl Check for 64bit versions of system calls
AC_CHECK_FUNC(stat64, AC_DEFINE(HAVE_STAT64))
AC_CHECK_FUNC(fstat64, AC_DEFINE(HAVE_FSTAT64))
AC_CHECK_FUNC(lstat64, AC_DEFINE(HAVE_LSTAT64))
AC_CHECK_FUNC(lseek64, AC_DEFINE(HAVE_LSEEK64))
AC_CHECK_FUNC(truncate64, AC_DEFINE(HAVE_TRUNCATE64))
AC_CHECK_FUNC(ftruncate64, AC_DEFINE(HAVE_FTRUNCATE64))

AC_CHECK_FUNC(strtoll, AC_DEFINE(HAVE_STRTOLL))
AC_CHECK_FUNC(hstrerror, AC_DEFINE(HAVE_HSTRERROR))
AC_CHECK_FUNC(inet_ntop, AC_DEFINE(HAVE_INET_NTOP))

#if test "$ac_cv_func_hstrerror" = "yes"; then
#  AC_MSG_CHECKING(if _XOPEN_SOURCE_EXTENDED is helpful)
#  AC_CACHE_VAL(ac_cv_xopen_source_extended,
#   [AC_TRY_COMPILE([#include <netdb.h>],
#   [hstrerror()],
#   [ac_cv_xopen_source_extended=no],
#   [AC_TRY_COMPILE([#define _XOPEN_SOURCE_EXTENDED 1
##  include <netdb.h>],
#     [hstrerror()],
#     [ac_cv_xopen_source_extended=yes],
#     [ac_cv_xopen_source_extended=no]
#   )]
#  )])
#  if test $ac_cv_xopen_source_extended = yes; then
#    AC_DEFINE(_XOPEN_SOURCE_EXTENDED)
#  fi
#  AC_MSG_RESULT($ac_cv_xopen_source_extended)
#fi

dnl Search for openpty()
# MacOS
AC_CHECK_FUNC(openpty, AC_DEFINE(HAVE_OPENPTY))
# AIX
AC_CHECK_LIB(bsd, openpty,
  [LIBS="-lbsd $LIBS"; AC_DEFINE(HAVE_OPENPTY)])
# Linux 2.4
AC_CHECK_LIB(util, openpty,
  [LIBS="-lutil $LIBS"; AC_DEFINE(HAVE_OPENPTY)])

AC_CHECK_LIB(rt, clock_gettime,
		 [LIBS="-lrt $LIBS"; AC_DEFINE(HAVE_CLOCK_GETTIME)])

dnl Search for flock()
# with Linux it's in libc, with AIX in libbsd
AC_CHECK_FUNC(flock, AC_DEFINE(HAVE_FLOCK),
	AC_CHECK_LIB(bsd, flock, [LIBS="-lbsd $LIBS"]))

dnl Search for setenv()
AC_CHECK_FUNC(setenv, AC_DEFINE(HAVE_SETENV),
	AC_CHECK_LIB(isode, setenv, [LIBS="-lisode $LIBS"]))

dnl Search for unsetenv()
AC_CHECK_FUNC(unsetenv, AC_DEFINE(HAVE_UNSETENV))

dnl Search for SSLv2_client_method, SSLv2_server_method
AC_CHECK_FUNC(SSLv2_client_method, AC_DEFINE(HAVE_SSLv2_client_method), AC_CHECK_LIB(crypt, SSLv2_client_method, [LIBS=-lcrypt $LIBS]))
AC_CHECK_FUNC(SSLv2_server_method, AC_DEFINE(HAVE_SSLv2_server_method), AC_CHECK_LIB(crypt, SSLv2_server_method, [LIBS=-lcrypt $LIBS]))
dnl 
AC_CHECK_FUNC(SSL_CTX_set_default_verify_paths, AC_DEFINE(HAVE_SSL_CTX_set_default_verify_paths))

AC_CHECK_FUNC(SSLv3_client_method, AC_DEFINE(HAVE_SSLv3_client_method), AC_CHECK_LIB(crypt, SSLv3_client_method, [LIBS=-lcrypt $LIBS]))
AC_CHECK_FUNC(SSLv3_server_method, AC_DEFINE(HAVE_SSLv3_server_method), AC_CHECK_LIB(crypt, SSLv3_server_method, [LIBS=-lcrypt $LIBS]))
AC_CHECK_FUNC(SSLv23_client_method, AC_DEFINE(HAVE_SSLv23_client_method), AC_CHECK_LIB(crypt, SSLv23_client_method, [LIBS=-lcrypt $LIBS]))
AC_CHECK_FUNC(SSLv23_server_method, AC_DEFINE(HAVE_SSLv23_server_method), AC_CHECK_LIB(crypt, SSLv23_server_method, [LIBS=-lcrypt $LIBS]))
AC_CHECK_FUNC(TLSv1_client_method, AC_DEFINE(HAVE_TLSv1_client_method), AC_CHECK_LIB(crypt, TLSv1_client_method, [LIBS=-lcrypt $LIBS]))
AC_CHECK_FUNC(TLSv1_server_method, AC_DEFINE(HAVE_TLSv1_server_method), AC_CHECK_LIB(crypt, TLSv1_server_method, [LIBS=-lcrypt $LIBS]))
AC_CHECK_FUNC(TLSv1_1_client_method, AC_DEFINE(HAVE_TLSv1_1_client_method), AC_CHECK_LIB(crypt, TLSv1_1_client_method, [LIBS=-lcrypt $LIBS]))
AC_CHECK_FUNC(TLSv1_1_server_method, AC_DEFINE(HAVE_TLSv1_1_server_method), AC_CHECK_LIB(crypt, TLSv1_1_server_method, [LIBS=-lcrypt $LIBS]))
AC_CHECK_FUNC(TLSv1_2_client_method, AC_DEFINE(HAVE_TLSv1_2_client_method), AC_CHECK_LIB(crypt, TLSv1_2_client_method, [LIBS=-lcrypt $LIBS]))
AC_CHECK_FUNC(TLSv1_2_server_method, AC_DEFINE(HAVE_TLSv1_2_server_method), AC_CHECK_LIB(crypt, TLSv1_2_server_method, [LIBS=-lcrypt $LIBS]))
AC_CHECK_FUNC(DTLSv1_client_method, AC_DEFINE(HAVE_DTLSv1_client_method), AC_CHECK_LIB(crypt, DTLSv1_client_method, [LIBS=-lcrypt $LIBS]))
AC_CHECK_FUNC(DTLSv1_server_method, AC_DEFINE(HAVE_DTLSv1_server_method), AC_CHECK_LIB(crypt, DTLSv1_server_method, [LIBS=-lcrypt $LIBS]))
AC_CHECK_FUNC(RAND_egd, AC_DEFINE(HAVE_RAND_egd), AC_CHECK_LIB(crypt, RAND_egd, [LIBS=-lcrypt $LIBS]))
AC_CHECK_FUNC(DH_set0_pqg, AC_DEFINE(HAVE_DH_set0_pqg), AC_CHECK_LIB(crypt, DH_set0_pqg, [LIBS=-lcrypt $LIBS]))
AC_CHECK_FUNC(ASN1_STRING_get0_data, AC_DEFINE(HAVE_ASN1_STRING_get0_data), AC_CHECK_LIB(crypt, ASN1_STRING_get0_data, [LIBS=-lcrypt $LIBS]))
AC_CHECK_FUNC(RAND_status, AC_DEFINE(HAVE_RAND_status))

AC_MSG_CHECKING(for type EC_KEY)
AC_CACHE_VAL(sc_cv_type_EC_TYPE,
[AC_TRY_COMPILE([#include <openssl/ec.h>
],[EC_KEY *s;],
[sc_cv_type_EC_KEY=yes],
[sc_cv_type_EC_KEY=no])])
if test $sc_cv_type_EC_KEY = yes; then
   AC_DEFINE(HAVE_TYPE_EC_KEY)
fi
AC_MSG_RESULT($sc_cv_type_EC_KEY)


dnl Run time checks


AC_MSG_CHECKING(if snprintf conforms to C99)
AC_CACHE_VAL(ac_cv_have_c99_snprintf,
[AC_TRY_RUN([
#include <stdio.h>
#include <stdlib.h>
int main(void){
char s[2];
exit(snprintf(s,2,"ab")!=2);
}],
[ac_cv_have_c99_snprintf=yes],
[ac_cv_have_c99_snprintf=no],
[ac_cv_have_c99_snprintf=no])])
if test $ac_cv_have_c99_snprintf = yes; then
   AC_DEFINE(HAVE_C99_SNPRINTF)
fi
AC_MSG_RESULT($ac_cv_have_c99_snprintf)


AC_MSG_CHECKING(if printf has Z modifier)
AC_CACHE_VAL(ac_cv_have_z_modifier,
if test "$cc" = gcc; then
[AC_TRY_RUN([
#include <stdlib.h>
#include <stdio.h>
int main(void){
char s[16];
sprintf(s,"%Zu",1);
exit(strcmp(s,"1"));
}],
[ac_cv_have_z_modifier=yes],
[ac_cv_have_z_modifier=no],
[ac_cv_have_z_modifier=no])]
else ac_cv_have_z_modifier=no
fi
)
if test $ac_cv_have_z_modifier = yes; then
   AC_DEFINE(HAVE_FORMAT_Z)
fi
AC_MSG_RESULT($ac_cv_have_z_modifier)


dnl find the number of bits we must shift a value to match the given mask
dnl (e.g., mask 0x00f0 requires shifting with 4)
## NOTE: some platforms only need one '\' to escape '"' in string constant
define(AC_SHIFT_OFFSET,[
AC_CACHE_CHECK(shift offset of $1, $2,
[LIBS1="$LIBS"; LIBS=""	# avoid libwrap allow_severity undefined
 conftestoffset="conftestoffset.out"
 AC_TRY_RUN([
 #include <errno.h>
 #include <stdlib.h>
 #include <stdio.h>
 #include <termios.h>
 #include <string.h>
 int main(){
    unsigned int i,n=$1;
    FILE *f;
    if ((f=fopen("$conftestoffset","w"))==NULL){
       fprintf(stderr,"\\"$conftestoffset\\": %s\n",strerror(errno)); exit(-1);
    }
    if (n==0) {fprintf(stderr,"$1 is 0 (impossible!)\n"); exit(1);}
    i=0; while (!(n&1)) {
       n>>=1; ++i; }
    if (3<<i == $1) {
       fprintf(f, "%u", i);
    } else {
       fprintf(f, "-1");	/* anticipate result of xioinitialize assert */
    }
    exit(0);
 }
 ],
 [$2=`cat $conftestoffset`],
 [$2=-1],
 [$2=-1]
)
 LIBS="$LIBS1"])
AC_DEFINE_UNQUOTED($1_SHIFT, ${$2})
if test "$2" = -1; then
AC_MSG_WARN(please determine $1_SHIFT manually)
fi
])

AC_SHIFT_OFFSET(CRDLY,  sc_cv_sys_crdly_shift)
AC_SHIFT_OFFSET(TABDLY, sc_cv_sys_tabdly_shift)
AC_SHIFT_OFFSET(CSIZE,  sc_cv_sys_csize_shift)


dnl Find what physical type (basic C type) is equivalent to the given type.
dnl If possible we try to compile simple test code and get no warning only with
dnl the matching type.
dnl If this method does not seem to work we run test programs that print the
dnl length and signedness of the type.

dnl do we have a -Werror option? 
dnl Does the test code compile with -Werror when types fit?
CHANCE_TO_TYPECHECK=1
CFLAGS1="$CFLAGS"; CFLAGS="$ERRONWARN $(echo "$CFLAGS1" | sed -e 's@-Wall@@g')"
AC_TRY_COMPILE([#include <stdlib.h>],[int u; int v; exit(&u==&v);],,CHANCE_TO_TYPECHECK=0)
CFLAGS="$CFLAGS1"

dnl Does the test code compile without -Werror when types do not fit?
if test "$CHANCE_TO_TYPECHECK" -ne 0; then
 AC_TRY_COMPILE([#include <stdlib.h>],[int u; unsigned int v; exit(&u==&v);],,CHANCE_TO_TYPECHECK=0)
fi

dnl Does the test code fail to compile with -Werror when types do not fit?
if test "$CHANCE_TO_TYPECHECK" -ne 0; then
 CFLAGS1="$CFLAGS"; CFLAGS="$ERRONWARN $(echo "$CFLAGS1" | sed -e 's@-Wall@@g')"
 AC_TRY_COMPILE([#include <stdlib.h>],[int u; unsigned int v; exit(&u==&v);],CHANCE_TO_TYPECHECK=0,)
 CFLAGS="$CFLAGS1"
fi

if test "$CHANCE_TO_TYPECHECK" -ne 0; then
   AC_MSG_NOTICE(using compile -Werror method to find basic types)
else
   AC_MSG_NOTICE(using code run method to find basic types)
fi


dnl see AC_BASIC_TYPE
define(AC_BASIC_TYPE_GCC,[
AC_CACHE_CHECK(for equivalent simple type of $2, $4,
[CFLAGS1="$CFLAGS"; CFLAGS="$ERRONWARN $(echo "$CFLAGS1" | sed -e 's@-Wall@@g')"
 dnl echo "echo: trying short for $2" >&2
 AC_TRY_COMPILE([$1],[$2 u; short v; return(&u==&v);],
 [$4="1 /* short */"],
 [AC_TRY_COMPILE([$1],[$2 u; unsigned short v; return(&u==&v);],
  [$4="2 /* unsigned short */"],
  [AC_TRY_COMPILE([$1],[$2 u; int v; return(&u==&v);],
   [$4="3 /* int */"],
   [AC_TRY_COMPILE([$1],[$2 u; unsigned int v; return(&u==&v);],
    [$4="4 /* unsigned int */"],
    [AC_TRY_COMPILE([$1],[$2 u; long v; return(&u==&v);],
     [$4="5 /* long */"],
     [AC_TRY_COMPILE([$1],[$2 u; unsigned long v; return(&u==&v);],
      [$4="6 /* unsigned long */"],
      [AC_TRY_COMPILE([$1],[$2 u; long long v; return(&u==&v);],
       [$4="7 /* long long */"],
       [AC_TRY_COMPILE([$1],[$2 u; unsigned long long v; return(&u==&v);],
        [$4="8 /* unsigned long long */"],
        [$4="0 /* unknown, taking default */"
]) ]) ]) ]) ]) ]) ]) ])
 CFLAGS="$CFLAGS1" ])
AC_DEFINE_UNQUOTED($3, ${$4})
])

dnl see AC_BASIC_TYPE
define(AC_BASIC_TYPE_OTHER,[
AC_CACHE_CHECK(for equivalent simple type of $2, $4,
[AC_TRY_RUN([
$1
int main() { return!(sizeof($2)==sizeof(short));}],
 # same length as short
 AC_TRY_RUN([
$1
int main() { $2 x=-1; return !(x<0);}],
  [$4="1 /* short */"],
  [$4="2 /* unsigned short */"]),
 # length differs from short, try others
 AC_TRY_RUN([
$1
int main() { return!(sizeof($2)==sizeof(int));}],
  # same length as int
  AC_TRY_RUN([
$1
int main() { $2 x=-1; return !(x<0);}],
   [$4="3 /* int */"],
   [$4="4 /* unsigned int */"]),
  # length differs from int, try others
  AC_TRY_RUN([
$1
int main() { return !(sizeof($2)==sizeof(long));}],
   # same length as long
   AC_TRY_RUN([
$1
int main() { $2 x=-1; return !(x<0);}],
    [$4="5 /* long */"],
    [$4="6 /* unsigned long */"] ),
   # length differs from long, try others
   AC_TRY_RUN([
$1
int main() { return !(sizeof($2)==sizeof(long long));}],
   # same length as long long
     AC_TRY_RUN([
$1
int main() { $2 x=-1; return !(x<0);}],
     [$4="7 /* long long */"],
     [$4="8 /* unsigned long long */"] ),
     [$4="0 /* unknown */"]
   )
  )
 )
)
])
AC_DEFINE_UNQUOTED($3, ${$4})
])

dnl find what physical type (basic C type) is equivalent to the given type.
dnl arg1: include file(s)
dnl arg2: type name
dnl arg3: output variable
dnl arg4: cache variable (might be constructed automatically)
dnl   output values: 1..short, 2..unsigned short, 3..int, 4..u-int,
dnl                  5..long, 6..u-long; others not yet supported
define(AC_BASIC_TYPE,[
   if test "$CHANCE_TO_TYPECHECK" -ne 0; then
      AC_BASIC_TYPE_GCC([$1],[$2],[$3],[$4])
   else
      AC_BASIC_TYPE_OTHER([$1],[$2],[$3],[$4])
   fi
])


dnl See AC_TYPEOF_COMPONENT
dnl This version is for compilers with -Werror or so: gcc, clang, Sun Studio?
define(AC_TYPEOF_COMPONENT_GCC,[
AC_CACHE_CHECK(for basic type of $2.$3, $5,
[CFLAGS1="$CFLAGS"; CFLAGS="$ERRONWARN $(echo "$CFLAGS1" | sed -e 's@-Wall@@g')"
AC_TRY_COMPILE([$1],[$2 u;short v; return(&u.$3==&v);],
[$5="1 /* short */"],
[AC_TRY_COMPILE([$1],[$2 u; unsigned short v; return(&u.$3==&v);],
 [$5="2 /* unsigned short */"],
 [AC_TRY_COMPILE([$1],[$2 u; int v; return(&u.$3==&v);],
  [$5="3 /* int */"],
  [AC_TRY_COMPILE([$1],[$2 u; unsigned int v; return(&u.$3==&v);],
   [$5="4 /* unsigned int */"],
   [AC_TRY_COMPILE([$1],[$2 u; long v; return(&u.$3==&v);],
    [$5="5 /* long */"],
    [AC_TRY_COMPILE([$1],[$2 u; unsigned long v; return(&u.$3==&v);],
     [$5="6 /* unsigned long */"],
     [AC_TRY_COMPILE([$1],[$2 u; long long v; return(&u.$3==&v);],
      [$5="7 /* long long */"],
      [AC_TRY_COMPILE([$1],[$2 u; unsigned long long v; return(&u.$3==&v);],
       [$5="8 /* unsigned long long */"],
       [$5="0 /* unknown, taking default */"
]) ]) ]) ]) ]) ]) ]) ])
 CFLAGS="$CFLAGS1" ])
AC_DEFINE_UNQUOTED($4, ${$5})
])

dnl See AC_TYPEOF_COMPONENT
dnl This version is for compilers with no -Werror or so
define(AC_TYPEOF_COMPONENT_OTHER,[
AC_CACHE_CHECK(for basic type of $2.$3, $5,
[AC_TRY_RUN([
$1
int main() { $2 x; return!(sizeof(x.$3)==sizeof(short));}],
 # same length as short
 AC_TRY_RUN([
$1
int main() { $2 x; x.$3=-1; return !(x.$3<0);}],
  [$5="1 /* short */"],
  [$5="2 /* unsigned short */"]),
 # length differs from short, try others
 AC_TRY_RUN([
$1
int main() { $2 x; return!(sizeof(x.$3)==sizeof(int));}],
  # same length as int
  AC_TRY_RUN([
$1
int main() { $2 x; x.$3=-1; return !(x.$3<0);}],
   [$5="3 /* int */"],
   [$5="4 /* unsigned int */"]),
  # length differs from int, try others
  AC_TRY_RUN([
$1
int main() { $2 x; return !(sizeof(x.$3)==sizeof(long));}],
   # same length as long
   AC_TRY_RUN([
$1
int main() { $2 x; x.$3=-1; return !(x.$3<0);}],
    [$5="5 /* long */"],
    [$5="6 /* unsigned long */"] ),
   # length differs from long, try others
   AC_TRY_RUN([
$1
int main() { $2 x; return !(sizeof(x.$3)==sizeof(long long));}],
   # same length as long long
     AC_TRY_RUN([
$1
int main() { x $2; x.$3=-1; return !(x.$3<0);}],
     [$5="7 /* long long */"],
     [$5="8 /* unsigned long long */"] ),
     [$5="0 /* unknown */"]
   )
  )
 )
)
])
AC_DEFINE_UNQUOTED($4, ${$5})
])

dnl find what physical type (basic C type) describes the given struct or union
dnl component.
dnl arg1: include file(s); must declare the structure type
dnl arg2: struct name (e.g., "struct stat")
dnl arg3: variable or component (e.g., "st_ino")
dnl arg4: output variable, values see AC_BASIC_TYPE
dnl arg5: cache variable (might be constructed automatically)
define(AC_TYPEOF_COMPONENT,[
   if test "$CHANCE_TO_TYPECHECK" -ne 0; then
      AC_TYPEOF_COMPONENT_GCC([$1],[$2],[$3],[$4],[$5])
   else
      AC_TYPEOF_COMPONENT_OTHER([$1],[$2],[$3],[$4],[$5])
   fi
])

AC_BASIC_TYPE([#include <stdlib.h>], size_t, HAVE_BASIC_SIZE_T, sc_cv_type_sizet_basic)
AC_BASIC_TYPE([#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>], mode_t, HAVE_BASIC_MODE_T, sc_cv_type_modet_basic)
AC_BASIC_TYPE([#include <sys/types.h>
#include <unistd.h>], pid_t, HAVE_BASIC_PID_T, sc_cv_type_pidt_basic)
AC_BASIC_TYPE([#include <sys/types.h>
#include <unistd.h>], uid_t, HAVE_BASIC_UID_T, sc_cv_type_uidt_basic)
AC_BASIC_TYPE([#include <sys/types.h>
#include <unistd.h>], gid_t, HAVE_BASIC_GID_T, sc_cv_type_gidt_basic)

AC_BASIC_TYPE([#include <time.h>], time_t, HAVE_BASIC_TIME_T,
	sc_cv_type_timet_basic)

# this is questionable, might fail on some systems
AC_BASIC_TYPE([#include <sys/types.h>
#include <sys/socket.h>
#include <unistd.h>], socklen_t, HAVE_BASIC_SOCKLEN_T,
	sc_cv_type_socklent_basic)

AC_BASIC_TYPE([#include <sys/types.h>
#include <unistd.h>], off_t, HAVE_BASIC_OFF_T, sc_cv_type_off_basic)

AC_BASIC_TYPE([#include <sys/types.h>
#include <unistd.h>], off64_t, HAVE_BASIC_OFF64_T, sc_cv_type_off64_basic)

# oh god, __dev_t in Linux 2.4 is struct{int[2];}, not handled here yet.
AC_BASIC_TYPE([#include <sys/stat.h>], dev_t, HAVE_BASIC_DEV_T, sc_cv_type_dev_basic)

AC_TYPEOF_COMPONENT([#include <sys/stat.h>], struct stat, st_ino, HAVE_TYPEOF_ST_INO, sc_cv_type_stat_stino_basic)
AC_TYPEOF_COMPONENT([#include <sys/stat.h>], struct stat, st_nlink, HAVE_TYPEOF_ST_NLINK, sc_cv_type_stat_stnlink_basic)
AC_TYPEOF_COMPONENT([#include <sys/stat.h>], struct stat, st_size, HAVE_TYPEOF_ST_SIZE, sc_cv_type_stat_stsize_basic)
AC_TYPEOF_COMPONENT([#include <sys/stat.h>], struct stat, st_blksize, HAVE_TYPEOF_ST_BLKSIZE, sc_cv_type_stat_stblksize_basic)
AC_TYPEOF_COMPONENT([#include <sys/stat.h>], struct stat, st_blocks, HAVE_TYPEOF_ST_BLOCKS, sc_cv_type_stat_stblocks_basic)
#
if test "$ac_cv_func_stat64" = yes; then
AC_TYPEOF_COMPONENT([#include <sys/stat.h>], struct stat64, st_dev, HAVE_TYPEOF_ST64_DEV, sc_cv_type_stat64_stdev_basic)
AC_TYPEOF_COMPONENT([#include <sys/stat.h>], struct stat64, st_ino, HAVE_TYPEOF_ST64_INO, sc_cv_type_stat64_stino_basic)
AC_TYPEOF_COMPONENT([#include <sys/stat.h>], struct stat64, st_nlink, HAVE_TYPEOF_ST64_NLINK, sc_cv_type_stat64_stnlink_basic)
AC_TYPEOF_COMPONENT([#include <sys/stat.h>], struct stat64, st_size, HAVE_TYPEOF_ST64_SIZE, sc_cv_type_stat64_stsize_basic)
AC_TYPEOF_COMPONENT([#include <sys/stat.h>], struct stat64, st_blksize, HAVE_TYPEOF_ST64_BLKSIZE, sc_cv_type_stat64_stblksize_basic)
AC_TYPEOF_COMPONENT([#include <sys/stat.h>], struct stat64, st_blocks, HAVE_TYPEOF_ST64_BLOCKS, sc_cv_type_stat64_stblocks_basic)
fi

AC_TYPEOF_COMPONENT([#include <sys/time.h>], struct timeval, tv_usec, HAVE_TYPEOF_STRUCT_TIMEVAL_TV_USEC, sc_cv_type_struct_timeval_tv_usec)

AC_TYPEOF_COMPONENT([#include <sys/types.h>
#include <sys/time.h>
#include <sys/resource.h>],
struct rlimit, rlim_max, HAVE_TYPEOF_RLIM_MAX, sc_cv_type_rlimit_rlimmax_basic)

# Fedora-19 doc says it is socklen_t which is equivalent to unsigned int, but it is equivalent to size_t (x86_64)
AC_TYPEOF_COMPONENT([#include "sysincludes.h"], struct cmsghdr, cmsg_len, HAVE_TYPEOF_STRUCT_CMSGHDR_CMSG_LEN, sc_cv_typeof_struct_cmsghdr_cmsg_len)
### snprintf, vsnprintf


AC_MSG_CHECKING(for /dev/ptmx)
if test -c /dev/ptmx; then
  AC_DEFINE(HAVE_DEV_PTMX, 1)
  AC_MSG_RESULT(yes)
else
  AC_MSG_RESULT(no)
  AC_MSG_CHECKING(for /dev/ptc)
  if test -c /dev/ptc; then
    AC_DEFINE(HAVE_DEV_PTC)
    AC_MSG_RESULT(yes)
  else
    AC_MSG_RESULT(no)
  fi
fi

AC_MSG_CHECKING(for /proc)
if test -d /proc; then
  AC_DEFINE(HAVE_PROC_DIR, 1)
  AC_MSG_RESULT(yes)
else
  AC_MSG_RESULT(no)
fi

AC_MSG_CHECKING(for /proc/*/fd)
if test -d /proc/$$/fd; then
  AC_DEFINE(HAVE_PROC_DIR_FD, 1)
  AC_MSG_RESULT(yes)
else
  AC_MSG_RESULT(no)
fi

dnl "tcpd" "tcpwrappers"
# on some platforms, raw linking with libwrap fails because allow_severity and
# deny_severity are not explicitely defined. Thus we put the libwrap part to
# the end
AC_MSG_CHECKING(whether to include libwrap support)
AC_ARG_ENABLE(libwrap, [  --disable-libwrap       disable libwrap support],
  [ case "$enableval" in
    no) AC_MSG_RESULT(no); WITH_LIBWRAP= ;;
    *) AC_MSG_RESULT(yes); WITH_LIBWRAP=1 ;;
   esac],
   [ AC_MSG_RESULT(yes);   WITH_LIBWRAP=1 ])
#
# check if we find the components of libwrap ("tcpd" "tcpwrappers")
if test -n "$WITH_LIBWRAP"; then
  AC_MSG_CHECKING(for components of libwrap)
  # first, we need to find the include file <tcpd.h>
  AC_CACHE_VAL(sc_cv_have_tcpd_h,
    [AC_TRY_COMPILE([#include <sys/types.h>
#include <tcpd.h>],[;],
      [sc_cv_have_tcpd_h=yes; LIBWRAP_ROOT=""],
      [sc_cv_have_tcpd_h=no
       for D in "/sw" "/usr/local" "/opt/freeware" "/usr/sfw"; do
	I="$D/include"
	i="$I/tcpd.h"
	if test -r "$i"; then
	  #V_INCL="$V_INCL -I$I"
	  CPPFLAGS="$CPPFLAGS -I$I"
	  AC_MSG_NOTICE(found $i)
	  sc_cv_have_tcpd_h=yes; LIBWRAP_ROOT="$D"
	  break;
	fi
      done])
  ])
  if test "$sc_cv_have_tcpd_h" = "yes"; then
    AC_DEFINE(HAVE_TCPD_H)
  fi
  AC_MSG_NOTICE(checked for tcpd.h... $sc_cv_have_tcpd_h)
fi	# end checking for tcpd.h
if test -n "$WITH_LIBWRAP" -a "$sc_cv_have_tcpd_h" = yes; then
  # next, we search for the wrap library (libwrap.*)
  AC_MSG_CHECKING(for libwrap)
  AC_CACHE_VAL(sc_cv_have_libwrap,
    [ LIBS0="$LIBS"
      if test -n "$LIBWRAP_ROOT"; then
	L="$LIBWRAP_ROOT/lib"; LIBS="-L$L -lwrap $LIBS"
      else
	LIBS="-lwrap $LIBS"
      fi
      AC_TRY_LINK([#include <sys/types.h>
#include <tcpd.h>
int allow_severity,deny_severity;],[hosts_access(0)],
      [sc_cv_have_libwrap='yes'],
      [sc_cv_have_libwrap='no'
	LIBS="$LIBS -lnsl"	# RedHat73
	AC_TRY_LINK([#include <sys/types.h>
#include <tcpd.h>
int allow_severity,deny_severity;],[hosts_access(0)],
      	  [sc_cv_have_libwrap='yes'],
	  [sc_cv_have_libwrap='no'])
      ]
      )
      if test "$sc_cv_have_libwrap" != 'yes'; then
	LIBS="$LIBS0"
      fi
    ]
  )
  if test "$sc_cv_have_libwrap" = 'yes'; then
    AC_DEFINE(HAVE_LIBWRAP)
  fi
  AC_MSG_RESULT($sc_cv_have_libwrap)
fi
#
if test -n "$WITH_LIBWRAP"; then
  if test "$sc_cv_have_tcpd_h" = "yes" -a "$sc_cv_have_libwrap" = "yes"; then
    AC_DEFINE(WITH_LIBWRAP)
  else
    AC_MSG_WARN([not all components of tcp wrappers found, disabling it]);
  fi
fi

# check of hosts_allow_table
if test -n "$WITH_LIBWRAP"; then
  AC_MSG_CHECKING(for hosts_allow_table)
  AC_CACHE_VAL(sc_cv_have_hosts_allow_table,
    [AC_TRY_COMPILE([#include <sys/types.h>
#include <tcpd.h>],[hosts_allow_table="";],
      [sc_cv_have_hosts_allow_table=yes],
      [sc_cv_have_hosts_allow_table=no])])
  if test $sc_cv_have_hosts_allow_table = yes; then
    AC_DEFINE(HAVE_HOSTS_ALLOW_TABLE)
  fi
  AC_MSG_RESULT($sc_cv_have_hosts_allow_table)
fi # test -n "$WITH_LIBWRAP"
  

if test "$GCC" = yes; then
   CFLAGS="$CFLAGS"
fi

# FIPS support requires compiling with fipsld.
# fipsld requires the FIPSLD_CC variable to be set to the original CC.
# This check must be done after all other checks that require compiling
# so that fipsld is not used by the configure script itself.
if test -n "$WITH_FIPS"; then
  if test "$sc_cv_have_openssl_fips_h" = 'yes' -a "$sc_cv_have_libcrypto" = 'yes'; then
    FIPSLD_CC=$CC
    if test "${FIPSLD+set}" != set ; then
        FIPSLD=fipsld
    fi
    CC="FIPSLD_CC=$CC $FIPSLD"
  fi
fi
AC_SUBST(FIPSLD_CC)

# autoconf does not seem to provide AC_CHECK_VAR or so
# thus we have to check by foot
AC_MSG_CHECKING(for declaration of environ)
AC_CACHE_VAL(sc_cv_decl_environ,
[AC_TRY_COMPILE([#include <unistd.h>],[char **s = environ;],
[sc_cv_decl_environ=yes],
[sc_cv_decl_environ=no])])
if test $sc_cv_decl_environ = yes; then
   AC_DEFINE(HAVE_DECL_ENVIRON)
fi
AC_MSG_RESULT($sc_cv_decl_environ)

# on some systems environ exists but not the declaration
AC_MSG_CHECKING(for var environ)
AC_CACHE_VAL(sc_cv_var_environ,
[AC_TRY_COMPILE([],[extern char **environ; char **s = environ;],
[sc_cv_var_environ=yes],
[sc_cv_var_environ=no])])
if test $sc_cv_var_environ = yes; then
   AC_DEFINE(HAVE_VAR_ENVIRON)
fi
AC_MSG_RESULT($sc_cv_var_environ)

# allow BUILD_DATE to be externally set for build reproducibility
if test "$BUILD_DATE"; then
  AC_DEFINE_UNQUOTED(BUILD_DATE, ["$BUILD_DATE"])
else
  AC_DEFINE(BUILD_DATE, [__DATE__" "__TIME__])
fi

AC_OUTPUT(Makefile)