File: acinclude.m4

package info (click to toggle)
sane-backends-extras 1.0.22.4
  • links: PTS
  • area: main
  • in suites: stretch
  • size: 3,080 kB
  • ctags: 2,710
  • sloc: ansic: 27,680; sh: 10,433; makefile: 448
file content (762 lines) | stat: -rw-r--r-- 20,502 bytes parent folder | download | duplicates (6)
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
dnl
dnl Contains the following macros
dnl   SANE_SET_CFLAGS(is_release)
dnl   SANE_CHECK_MISSING_HEADERS
dnl   SANE_SET_LDFLAGS
dnl   SANE_CHECK_DLL_LIB
dnl   SANE_EXTRACT_LDFLAGS(LIBS, LDFLAGS)
dnl   SANE_CHECK_JPEG
dnl   SANE_CHECK_IEEE1284
dnl   SANE_CHECK_PTHREAD
dnl   SANE_CHECK_LOCKING
dnl   JAPHAR_GREP_CFLAGS(flag, cmd_if_missing, cmd_if_present)
dnl   SANE_LINKER_RPATH
dnl   SANE_CHECK_U_TYPES
dnl   SANE_CHECK_GPHOTO2
dnl   SANE_CHECK_IPV6
dnl   SANE_CHECK_BACKENDS
dnl   SANE_PROTOTYPES
dnl   AC_PROG_LIBTOOL
dnl

# SANE_SET_CFLAGS(is_release)
# Set CFLAGS. Enable/disable compilation warnings if we gcc is used.
# Warnings are enabled by default when in development cycle but disabled
# when a release is made. The argument is_release is either yes or no.
AC_DEFUN([SANE_SET_CFLAGS],
[
if test "${ac_cv_c_compiler_gnu}" = "yes"; then
  NORMAL_CFLAGS="\
      -W \
      -Wall"
  WARN_CFLAGS="\
      -W \
      -Wall \
      -Wcast-align \
      -Wcast-qual \
      -Wmissing-declarations \
      -Wmissing-prototypes \
      -Wpointer-arith \
      -Wreturn-type \
      -Wstrict-prototypes \
      -pedantic"

  # Some platforms are overly strict with -ansi enabled.  Exclude those.
  ANSI_FLAG=-ansi
  case "${host_os}" in  
    solaris* | hpux* | os2* | darwin* | cygwin* | mingw*)
      ANSI_FLAG=
      ;;
  esac
  WARN_CFLAGS="${WARN_CFLAGS} ${ANSI_FLAG}"

  AC_ARG_ENABLE(warnings,
    AC_HELP_STRING([--enable-warnings],
                   [turn on tons of compiler warnings (GCC only)]),
    [
      if eval "test x$enable_warnings = xyes"; then 
        for flag in $WARN_CFLAGS; do
          JAPHAR_GREP_CFLAGS($flag, [ CFLAGS="$CFLAGS $flag" ])
        done
      else
        for flag in $NORMAL_CFLAGS; do
          JAPHAR_GREP_CFLAGS($flag, [ CFLAGS="$CFLAGS $flag" ])
        done
      fi
    ],
    [if test x$1 = xno; then
       # Warnings enabled by default (development)
       for flag in $WARN_CFLAGS; do
         JAPHAR_GREP_CFLAGS($flag, [ CFLAGS="$CFLAGS $flag" ])
       done
    else
       # Warnings disabled by default (release)
       for flag in $NORMAL_CFLAGS; do
         JAPHAR_GREP_CFLAGS($flag, [ CFLAGS="$CFLAGS $flag" ])
       done
    fi])
fi # ac_cv_c_compiler_gnu
])

dnl SANE_CHECK_MISSING_HEADERS
dnl Do some sanity checks. It doesn't make sense to proceed if those headers
dnl aren't present.
AC_DEFUN([SANE_CHECK_MISSING_HEADERS],
[
  MISSING_HEADERS=
  if test "${ac_cv_header_fcntl_h}" != "yes" ; then
    MISSING_HEADERS="${MISSING_HEADERS}\"fcntl.h\" "
  fi
  if test "${ac_cv_header_sys_time_h}" != "yes" ; then
    MISSING_HEADERS="${MISSING_HEADERS}\"sys/time.h\" "
  fi
  if test "${ac_cv_header_unistd_h}" != "yes" ; then
    MISSING_HEADERS="${MISSING_HEADERS}\"unistd.h\" "
  fi
  if test "${ac_cv_header_stdc}" != "yes" ; then
    MISSING_HEADERS="${MISSING_HEADERS}\"ANSI C headers\" "
  fi
  if test "${MISSING_HEADERS}" != "" ; then
    echo "*** The following essential header files couldn't be found:"
    echo "*** ${MISSING_HEADERS}"
    echo "*** Maybe the compiler isn't ANSI C compliant or not properly installed?"
    echo "*** For details on what went wrong see config.log."
    AC_MSG_ERROR([Exiting now.])
  fi
])

# SANE_SET_LDFLAGS
# Add special LDFLAGS
AC_DEFUN([SANE_SET_LDFLAGS],
[
  # Define stricter linking policy on GNU systems.  This is not
  # added to global LDFLAGS because we may want to create convenience
  # libraries that don't require such strick linking.
  if test "$GCC" = yes; then
    case ${host_os} in
    linux* | solaris*)
      STRICT_LDFLAGS="-Wl,-z,defs"
      ;;
    esac
  fi
  AC_SUBST(STRICT_LDFLAGS)
  case "${host_os}" in  
    aix*) #enable .so libraries, disable archives
      LDFLAGS="$LDFLAGS -Wl,-brtl"
      ;;
    darwin*) #include frameworks
      LIBS="$LIBS -framework CoreFoundation -framework IOKit"
      ;;
  esac
])

# SANE_CHECK_DLL_LIB
# Find dll library
AC_DEFUN([SANE_CHECK_DLL_LIB],
[
  dnl Checks for dll libraries: dl
  DL_LIBS=""
  if test "${enable_dynamic}" != "no"; then
      # dlopen
      AC_CHECK_HEADERS(dlfcn.h,
      [AC_CHECK_LIB(dl, dlopen, DL_LIBS=-ldl)
       saved_LIBS="${LIBS}"
       LIBS="${LIBS} ${DL_LIBS}"
       AC_CHECK_FUNCS(dlopen, enable_dynamic=yes,)
       LIBS="${saved_LIBS}"
      ],)
      # HP/UX DLL handling
      AC_CHECK_HEADERS(dl.h,
      [AC_CHECK_LIB(dld,shl_load, DL_LIBS=-ldld)
       saved_LIBS="${LIBS}"
       LIBS="${LIBS} ${DL_LIBS}"
       AC_CHECK_FUNCS(shl_load, enable_dynamic=yes,)
       LIBS="${saved_LIBS}"
      ],)
      if test -z "$DL_LIBS" ; then
      # old Mac OS X/Darwin (without dlopen)
      AC_CHECK_HEADERS(mach-o/dyld.h,
      [AC_CHECK_FUNCS(NSLinkModule, enable_dynamic=yes,)
      ],)
      fi
  fi
  AC_SUBST(DL_LIBS)

  DYNAMIC_FLAG=
  if test "${enable_dynamic}" = yes ; then
    DYNAMIC_FLAG=-module
  fi
  AC_SUBST(DYNAMIC_FLAG)
])

#
# Separate LIBS from LDFLAGS to link correctly on HP/UX (and other
# platforms who care about the order of params to ld.  It removes all
# non '-l..'-params from passed in $1(LIBS), and appends them to $2(LDFLAGS).
#
# Use like this: SANE_EXTRACT_LDFLAGS(PKGNAME_LIBS, PKGNAME_LDFLAGS)
 AC_DEFUN([SANE_EXTRACT_LDFLAGS],
[
    tmp_LIBS=""
    for param in ${$1}; do
        case "${param}" in
	-l*)
         tmp_LIBS="${tmp_LIBS} ${param}"
	 ;;
	 *)
         $2="${$2} ${param}"
	 ;;
	 esac
     done
     $1="${tmp_LIBS}"
     unset tmp_LIBS
     unset param
])

#
#
# Checks for ieee1284 library, needed for canon_pp backend.
AC_DEFUN([SANE_CHECK_IEEE1284],
[
  AC_CHECK_HEADER(ieee1284.h, [
    AC_CACHE_CHECK([for libieee1284 >= 0.1.5], sane_cv_use_libieee1284, [
      AC_TRY_COMPILE([#include <ieee1284.h>], [
	struct parport p; char *buf; 
	ieee1284_nibble_read(&p, 0, buf, 1);
 	], 
        [sane_cv_use_libieee1284="yes"; IEEE1284_LIBS="-lieee1284"
      ],[sane_cv_use_libieee1284="no"])
    ],)
  ],)
  if test "$sane_cv_use_libieee1284" = "yes" ; then
    AC_DEFINE(HAVE_LIBIEEE1284,1,[Define to 1 if you have the `ieee1284' library (-lcam).])
  fi
  AC_SUBST(IEEE1284_LIBS)
])

#
# Checks for pthread support
AC_DEFUN([SANE_CHECK_PTHREAD],
[

  case "${host_os}" in
  darwin* | mingw*) # currently only enabled on MacOS X on MINGW
    use_pthread=yes
    ;;
  *)
    use_pthread=no
  esac
  have_pthread=no

  #
  # now that we have the systems preferences, we check
  # the user

  AC_ARG_ENABLE([pthread],
    AC_HELP_STRING([--enable-pthread],
                   [use pthread instead of fork (default=yes for MacOS X/MINGW, no for everything else)]),
    [
      if test $enableval = yes ; then
        use_pthread=yes
      else
        use_pthread=no
      fi
    ])

  if test $use_pthread = yes ; then
  AC_CHECK_HEADERS(pthread.h,
    [
       AC_CHECK_LIB(pthread, pthread_create, PTHREAD_LIBS="-lpthread")
       have_pthread=yes
       save_LIBS="$LIBS"
       LIBS="$LIBS $PTHREAD_LIBS"
       AC_CHECK_FUNCS([pthread_create pthread_kill pthread_join pthread_detach pthread_cancel pthread_testcancel],
	,[ have_pthread=no; use_pthread=no ])
       LIBS="$save_LIBS"
    ],)
  fi
 
  if test $use_pthread = yes ; then
    AC_DEFINE_UNQUOTED(USE_PTHREAD, "$use_pthread",
                   [Define if pthreads should be used instead of forked processes.])
  else
    dnl Reset library in case it was found but we are not going to use it.
    PTHREAD_LIBS=""
  fi
  if test "$have_pthread" = "yes" ; then
    CPPFLAGS="${CPPFLAGS} -D_REENTRANT"
  fi
  AC_SUBST(PTHREAD_LIBS)
  AC_MSG_CHECKING([whether to enable pthread support])
  AC_MSG_RESULT([$have_pthread])
  AC_MSG_CHECKING([whether to use pthread instead of fork])
  AC_MSG_RESULT([$use_pthread])
])

#
# Checks for jpeg library >= v6B (61), needed for DC210,  DC240,
# GPHOTO2 and dell1600n_net backends.
AC_DEFUN([SANE_CHECK_JPEG],
[
  AC_CHECK_LIB(jpeg,jpeg_start_decompress, 
  [
    AC_CHECK_HEADER(jconfig.h, 
    [
      AC_MSG_CHECKING([for jpeglib - version >= 61 (6a)])
      AC_EGREP_CPP(sane_correct_jpeg_lib_version_found,
      [
        #include <jpeglib.h>
        #if JPEG_LIB_VERSION >= 61
          sane_correct_jpeg_lib_version_found
        #endif
      ], [sane_cv_use_libjpeg="yes"; JPEG_LIBS="-ljpeg"; 
      AC_MSG_RESULT(yes)],[AC_MSG_RESULT(no)])
    ],)
  ],)
  if test "$sane_cv_use_libjpeg" = "yes" ; then
    AC_DEFINE(HAVE_LIBJPEG,1,[Define to 1 if you have the libjpeg library.])
  fi
  AC_SUBST(JPEG_LIBS)
])

# Checks for tiff library dell1600n_net backend.
AC_DEFUN([SANE_CHECK_TIFF],
[
  AC_CHECK_LIB(tiff,TIFFFdOpen, 
  [
    AC_CHECK_HEADER(tiffio.h, 
    [sane_cv_use_libtiff="yes"; TIFF_LIBS="-ltiff"],)
  ],)
  AC_SUBST(TIFF_LIBS)
])

#
# Checks for pthread support
AC_DEFUN([SANE_CHECK_LOCKING],
[
  LOCKPATH_GROUP=uucp
  use_locking=yes
  case "${host_os}" in
    os2* )
      use_locking=no
      ;;
  esac

  #
  # we check the user
  AC_ARG_ENABLE( [locking],
    AC_HELP_STRING([--enable-locking],
                   [activate device locking (default=yes, but only used by some backends)]),
    [
      if test $enableval = yes ; then
        use_locking=yes
      else
        use_locking=no
      fi
    ])
  if test $use_locking = yes ; then
    AC_ARG_WITH([group],
      AC_HELP_STRING([--with-group],
                     [use the specified group for lock dir @<:@default=uucp@:>@]),
        [LOCKPATH_GROUP="$withval"]
    )
    # check if the group does exist
    lasterror=""
    touch sanetest.file
    chgrp $LOCKPATH_GROUP sanetest.file 2>/dev/null || lasterror=$?
    rm -f sanetest.file
    if test ! -z "$lasterror"; then
      AC_MSG_WARN([Group $LOCKPATH_GROUP does not exist on this system.])
      AC_MSG_WARN([Locking feature will be disabled.])
      use_locking=no
    fi
  fi
  if test $use_locking = yes ; then
    INSTALL_LOCKPATH=install-lockpath
    AC_DEFINE([ENABLE_LOCKING], 1, 
              [Define to 1 if device locking should be enabled.])
  else
    INSTALL_LOCKPATH=
  fi
  AC_MSG_CHECKING([whether to enable device locking])
  AC_MSG_RESULT([$use_locking])
  if test $use_locking = yes ; then
    AC_MSG_NOTICE([Setting lockdir group to $LOCKPATH_GROUP])
  fi
  AC_SUBST(INSTALL_LOCKPATH)
  AC_SUBST(LOCKPATH_GROUP)
])

dnl
dnl JAPHAR_GREP_CFLAGS(flag, cmd_if_missing, cmd_if_present)
dnl
dnl From Japhar.  Report changes to japhar@hungry.com
dnl
AC_DEFUN([JAPHAR_GREP_CFLAGS],
[case "$CFLAGS" in
"$1" | "$1 "* | *" $1" | *" $1 "* )
  ifelse($#, 3, [$3], [:])
  ;;
*)
  $2
  ;;
esac
])

dnl
dnl SANE_LINKER_RPATH
dnl
dnl Detect how to set runtime link path (rpath).  Set variable
dnl LINKER_RPATH.  Typical content will be '-Wl,-rpath,' or '-R '.  If
dnl set, add '${LINKER_RPATH}${libdir}' to $LDFLAGS
dnl

AC_DEFUN([SANE_LINKER_RPATH],
[dnl AC_REQUIRE([AC_SUBST])dnl This line resulted in an empty AC_SUBST() !!
  AC_MSG_CHECKING([whether runtime link path should be used])
  AC_ARG_ENABLE([rpath],
    [AS_HELP_STRING([--enable-rpath],
      [use runtime library search path @<:@default=yes@:>@])])

  LINKER_RPATH=
  AS_IF([test "x$enable_rpath" != xno],
  AC_MSG_RESULT([yes])
    [AC_CACHE_CHECK([linker parameter to set runtime link path], my_cv_LINKER_RPATH,
      [my_cv_LINKER_RPATH=
      case "$host_os" in
      linux* | freebsd* | netbsd* | openbsd* | irix*)
        # I believe this only works with GNU ld [pere 2001-04-16]
        my_cv_LINKER_RPATH="-Wl,-rpath,"
        ;;
      solaris*)
        my_cv_LINKER_RPATH="-R "
        ;;
      esac
      ])
      LINKER_RPATH="$my_cv_LINKER_RPATH"],
    [AC_MSG_RESULT([no])
      LINKER_RPATH=])
  AC_SUBST(LINKER_RPATH)dnl
])

dnl
dnl   SANE_CHECK_U_TYPES
dnl
AC_DEFUN([SANE_CHECK_U_TYPES],
[
dnl Use new style of check types that doesn't take default to use.
dnl The old style would add an #undef of the type check on platforms
dnl that defined that type... That is not portable to platform that
dnl define it as a #define.
AC_CHECK_TYPES([u_char, u_short, u_int, u_long],,,)
])

#
# Checks for gphoto2 libs, needed by gphoto2 backend
AC_DEFUN([SANE_CHECK_GPHOTO2],
[
  AC_ARG_WITH(gphoto2,
	      AC_HELP_STRING([--with-gphoto2],
			     [include the gphoto2 backend @<:@default=yes@:>@]),
	      [# If --with-gphoto2=no or --without-gphoto2, disable backend
               # as "$with_gphoto2" will be set to "no"])

  # If --with-gphoto2=yes (or not supplied), first check if 
  # pkg-config exists, then use it to check if libgphoto2 is
  # present.  If all that works, then see if we can actually link
  # a program.   And, if that works, then add the -l flags to 
  # GPHOTO2_LIBS and any other flags to GPHOTO2_LDFLAGS to pass to 
  # sane-config.
  if test "$with_gphoto2" != "no" ; then 
    AC_CHECK_TOOL(HAVE_GPHOTO2, pkg-config, false)

    if test ${HAVE_GPHOTO2} != "false" ; then
      if pkg-config --exists libgphoto2 ; then
        with_gphoto2="`pkg-config --modversion libgphoto2`"
	GPHOTO2_CPPFLAGS="`pkg-config --cflags libgphoto2`"
        GPHOTO2_LIBS="`pkg-config --libs libgphoto2`"

        saved_CPPFLAGS="${CPPFLAGS}"
        CPPFLAGS="${GPHOTO2_CPPFLAGS}"
	saved_LIBS="${LIBS}"
	LIBS="${LIBS} ${GPHOTO2_LIBS}"
 	# Make sure we an really use the library
        AC_CHECK_FUNCS(gp_camera_init, HAVE_GPHOTO2=true, HAVE_GPHOTO2=false)
	if test "${HAVE_GPHOTO2}" = "true"; then
	  AC_CHECK_FUNCS(gp_port_info_get_path)
	fi
	CPPFLAGS="${saved_CPPFLAGS}"
        LIBS="${saved_LIBS}"
      else
        HAVE_GPHOTO2=false
      fi
      if test "${HAVE_GPHOTO2}" = "false"; then
        GPHOTO2_CPPFLAGS="" 
        GPHOTO2_LIBS="" 
      else
        SANE_EXTRACT_LDFLAGS(GPHOTO2_LIBS, GPHOTO2_LDFLAGS)
      fi
    fi
  fi
  AC_SUBST(GPHOTO2_CPPFLAGS)
  AC_SUBST(GPHOTO2_LIBS)
  AC_SUBST(GPHOTO2_LDFLAGS)
])

#
# Check for AF_INET6, determines whether or not to enable IPv6 support
# Check for ss_family member in struct sockaddr_storage
AC_DEFUN([SANE_CHECK_IPV6],
[
  AC_MSG_CHECKING([whether to enable IPv6]) 
  AC_ARG_ENABLE(ipv6, 
    AC_HELP_STRING([--disable-ipv6],[disable IPv6 support]), 
      [  if test "$enableval" = "no" ; then
         AC_MSG_RESULT([no, manually disabled]) 
         ipv6=no 
         fi
      ])

  if test "$ipv6" != "no" ; then
    AC_TRY_COMPILE([
	#define INET6 
	#include <sys/types.h> 
	#include <sys/socket.h> ], [
	 /* AF_INET6 available check */  
 	if (socket(AF_INET6, SOCK_STREAM, 0) < 0) 
   	  exit(1); 
 	else 
   	  exit(0); 
      ],[
        AC_MSG_RESULT(yes) 
        AC_DEFINE([ENABLE_IPV6], 1, [Define to 1 if the system supports IPv6]) 
        ipv6=yes
      ],[
        AC_MSG_RESULT([no (couldn't compile test program)]) 
        ipv6=no
      ])
  fi

  if test "$ipv6" != "no" ; then
    AC_MSG_CHECKING([whether struct sockaddr_storage has an ss_family member])
    AC_TRY_COMPILE([
	#define INET6
	#include <sys/types.h>
	#include <sys/socket.h> ], [
	/* test if the ss_family member exists in struct sockaddr_storage */
	struct sockaddr_storage ss;
	ss.ss_family = AF_INET;
	exit (0);
    ], [
	AC_MSG_RESULT(yes)
	AC_DEFINE([HAS_SS_FAMILY], 1, [Define to 1 if struct sockaddr_storage has an ss_family member])
    ], [
		AC_TRY_COMPILE([
		#define INET6
		#include <sys/types.h>
		#include <sys/socket.h> ], [
		/* test if the __ss_family member exists in struct sockaddr_storage */
		struct sockaddr_storage ss;
		ss.__ss_family = AF_INET;
		exit (0);
	  ], [
		AC_MSG_RESULT([no, but __ss_family exists])
		AC_DEFINE([HAS___SS_FAMILY], 1, [Define to 1 if struct sockaddr_storage has __ss_family instead of ss_family])
	  ], [
		AC_MSG_RESULT([no])
		ipv6=no
    	  ])
    ])
  fi	
])

#
# Verifies that values in $BACKENDS and updates FILTERED_BACKEND
# with either backends that can be compiled or fails the script.
AC_DEFUN([SANE_CHECK_BACKENDS],
[
if test "${user_selected_backends}" = "yes"; then
  DISABLE_MSG="aborting"
else
  DISABLE_MSG="disabling"
fi

FILTERED_BACKENDS=""
for be in ${BACKENDS}; do
  backend_supported="yes"
  case $be in
    plustek_pp)
    case "$host_os" in
      gnu*) 
      echo "*** $be backend not supported on GNU/Hurd - $DISABLE_MSG"
      backend_supported="no"
      ;;
    esac
    ;;

    dc210|dc240)
    if test "${sane_cv_use_libjpeg}" != "yes"; then
      echo "*** $be backend requires JPEG library - $DISABLE_MSG"
      backend_supported="no"
    fi
    ;;

    canon_pp|hpsj5s)
    if test "${sane_cv_use_libieee1284}" != "yes"; then
      echo "*** $be backend requires libieee1284 library - $DISABLE_MSG"
      backend_supported="no"
    fi
    ;;

    mustek_pp)
    if test "${sane_cv_use_libieee1284}" != "yes" && test "${enable_parport_directio}" != "yes"; then
      echo "*** $be backend requires libieee1284 and paraport-directio libraries - $DISABLE_MSG"
      backend_supported="no"
    fi
    ;;

    dell1600n_net) 
    if test "${sane_cv_use_libjpeg}" != "yes" || test "${sane_cv_use_libtiff}" != "yes"; then
      echo "*** $be backend requires JPEG and/or TIFF library - $DISABLE_MSG"
      backend_supported="no"
    fi
    ;;

    gphoto2)
    if test "${HAVE_GPHOTO2}" != "true" \
      -o "${sane_cv_use_libjpeg}" != "yes"; then
      echo "*** $be backend requires gphoto2 and JPEG libraries - $DISABLE_MSG"
      backend_supported="no"
    fi
    ;;

    pint)
    if test "${ac_cv_header_sys_scanio_h}" = "no"; then
      echo "*** $be backend requires sys/scanio.h - $DISABLE_MSG"
      backend_supported="no"
    fi
    ;;

    qcam)
    if test "${ac_cv_func_ioperm}" = "no" \
      && test "${ac_cv_func__portaccess}" = "no"; then
      echo "*** $be backend requires ioperm and portaccess functions - $DISABLE_MSG"
      backend_supported="no"
    fi
    ;;

    v4l)
    if test "${have_linux_ioctl_defines}" != "yes" \
      || test "${have_libv4l1}" != "yes"; then
      echo "*** $be backend requires v4l libraries - $DISABLE_MSG"
      backend_supported="no"
    fi
    ;;

    net)
    if test "${ac_cv_header_sys_socket_h}" = "no"; then
      echo "*** $be backend requires sys/socket.h - $DISABLE_MSG"
      backend_supported="no"
    fi
    ;;

    mustek_usb2)
    if test "${have_pthread}" != "yes"; then
      echo "*** $be backend requires pthread library - $DISABLE_MSG"
      backend_supported="no"
    fi
    ;;
  esac
  if test "${backend_supported}" = "no"; then
    if test "${user_selected_backends}" = "yes"; then
      exit 1
    fi
  else
    FILTERED_BACKENDS="${FILTERED_BACKENDS} $be"
  fi
done
])

#
# Generate prototypes for functions not available on the system
AC_DEFUN([SANE_PROTOTYPES],
[
AH_BOTTOM([

#if defined(__MINGW32__)
#define _BSDTYPES_DEFINED
#endif

#ifndef HAVE_U_CHAR
#define u_char unsigned char
#endif
#ifndef HAVE_U_SHORT
#define u_short unsigned short
#endif
#ifndef HAVE_U_INT
#define u_int unsigned int
#endif
#ifndef HAVE_U_LONG
#define u_long unsigned long
#endif

/* Prototype for getenv */
#ifndef HAVE_GETENV
#define getenv sanei_getenv
char * getenv(const char *name);
#endif

/* Prototype for inet_ntop */
#ifndef HAVE_INET_NTOP
#define inet_ntop sanei_inet_ntop
#include <sys/types.h>
const char * inet_ntop (int af, const void *src, char *dst, size_t cnt);
#endif

/* Prototype for inet_pton */
#ifndef HAVE_INET_PTON
#define inet_pton sanei_inet_pton
int inet_pton (int af, const char *src, void *dst);
#endif

/* Prototype for isfdtype */
#ifndef HAVE_ISFDTYPE
#define isfdtype sanei_isfdtype
int isfdtype(int fd, int fdtype);
#endif

/* Prototype for sigprocmask */
#ifndef HAVE_SIGPROCMASK
#define sigprocmask sanei_sigprocmask
int sigprocmask (int how, int *new, int *old);
#endif

/* Prototype for snprintf */
#ifndef HAVE_SNPRINTF
#define snprintf sanei_snprintf
#include <sys/types.h>
int snprintf (char *str,size_t count,const char *fmt,...);
#endif

/* Prototype for strcasestr */
#ifndef HAVE_STRCASESTR
#define strcasestr sanei_strcasestr
char * strcasestr (const char *phaystack, const char *pneedle);
#endif

/* Prototype for strdup */
#ifndef HAVE_STRDUP
#define strdup sanei_strdup
char *strdup (const char * s);
#endif

/* Prototype for strndup */
#ifndef HAVE_STRNDUP
#define strndup sanei_strndup
#include <sys/types.h>
char *strndup(const char * s, size_t n);
#endif

/* Prototype for strsep */
#ifndef HAVE_STRSEP
#define strsep sanei_strsep
char *strsep(char **stringp, const char *delim);
#endif

/* Prototype for usleep */
#ifndef HAVE_USLEEP
#define usleep sanei_usleep
unsigned int usleep (unsigned int useconds);
#endif

/* Prototype for vsyslog */
#ifndef HAVE_VSYSLOG
#include <stdarg.h>
void vsyslog(int priority, const char *format, va_list args);
#endif
])
])

m4_include([m4/libtool.m4])
m4_include([m4/byteorder.m4])
m4_include([m4/stdint.m4])