1 files changed, 4 insertions, 0 deletions
diff --git a/make.h b/make.h
index 5b9c05e..94f760e 100644
--- a/make.h
+++ b/make.h
@@ -65,6 +65,10 @@ extern int errno;
 #undef POSIX
 #endif
 
+#if !defined (POSIX) && defined (_AIX) && defined (_POSIX_SOURCE)
+#define POSIX
+#endif
+
 #if !defined (HAVE_SYS_SIGLIST) && defined (HAVE__SYS_SIGLIST)
 #define	sys_siglist	_sys_siglist
 #define	HAVE_SYS_SIGLIST	/* Now we have it.  */