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-rw-r--r--lib/regex.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/lib/regex.c b/lib/regex.c
index d0086ed1a..89a77f8d9 100644
--- a/lib/regex.c
+++ b/lib/regex.c
@@ -238,7 +238,11 @@ init_syntax_once ()
#include <alloca.h>
#else /* not __GNUC__ or HAVE_ALLOCA_H */
#ifndef _AIX /* Already did AIX, up at the top. */
+#if defined (__STDC__) && __STDC__
+void *alloca ();
+#else
char *alloca ();
+#endif
#endif /* not _AIX */
#endif /* not HAVE_ALLOCA_H */
#endif /* not __GNUC__ */