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--- getopt-core.h.bak 2020-06-26 21:24:59.890340657 +0200
+++ getopt-core.h 2020-07-28 19:48:27.769014629 +0200
@@ -20,6 +20,14 @@
#ifndef _GETOPT_CORE_H
#define _GETOPT_CORE_H 1
+/* Ensure that DLL_VARIABLE is defined. Since on OSF/1 4.0 and Irix 6.5
+ <stdlib.h> includes <getopt.h>, and <config.h> is not a prerequisite for
+ using <stdlib.h>, this file can be included without a prior
+ "#include <config.h>". */
+#if !defined DLL_VARIABLE && defined HAVE_CONFIG_H
+# include <config.h>
+#endif
+
/* This header should not be used directly; include getopt.h or
unistd.h instead. Unlike most bits headers, it does not have
a protective #error, because the guard macro for getopt.h in
@@ -33,7 +41,7 @@
Also, when 'ordering' is RETURN_IN_ORDER,
each non-option ARGV-element is returned here. */
-extern char *optarg;
+extern DLL_VARIABLE char *optarg;
/* Index in ARGV of the next element to be scanned.
This is used for communication to and from the caller
@@ -47,16 +55,16 @@
Otherwise, 'optind' communicates from one call to the next
how much of ARGV has been scanned so far. */
-extern int optind;
+extern DLL_VARIABLE int optind;
/* Callers store zero here to inhibit the error message 'getopt' prints
for unrecognized options. */
-extern int opterr;
+extern DLL_VARIABLE int opterr;
/* Set to an option character which was unrecognized. */
-extern int optopt;
+extern DLL_VARIABLE int optopt;
/* Get definitions and prototypes for functions to process the
arguments in ARGV (ARGC of them, minus the program name) for
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