1 files changed, 12 insertions, 2 deletions

diff --git a/gl/m4/errno_h.m4 b/gl/m4/errno_h.m4
index 4c70d225..420d5bb3 100644
--- a/gl/m4/errno_h.m4
+++ b/gl/m4/errno_h.m4
@@ -1,14 +1,21 @@
-# errno_h.m4 serial 14
-dnl Copyright (C) 2004, 2006, 2008-2023 Free Software Foundation, Inc.
+# errno_h.m4
+# serial 18
+dnl Copyright (C) 2004, 2006, 2008-2025 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
+dnl This file is offered as-is, without any warranty.
 
 AC_PREREQ([2.61])
 
 AC_DEFUN_ONCE([gl_HEADER_ERRNO_H],
 [
   AC_REQUIRE([AC_PROG_CC])
+
+  dnl Through the dependency on module extensions-aix, _LINUX_SOURCE_COMPAT
+  dnl gets defined already before this macro gets invoked.  This persuades
+  dnl AIX 7.3 errno.h to assign ENOTEMPTY a value different than EEXIST.
+
   AC_CACHE_CHECK([for complete errno.h], [gl_cv_header_errno_h_complete], [
     AC_EGREP_CPP([booboo],[
 #include <errno.h>
@@ -63,6 +70,9 @@ booboo
 #if !defined EILSEQ
 booboo
 #endif
+#if !defined ESOCKTNOSUPPORT
+booboo
+#endif
       ],
       [gl_cv_header_errno_h_complete=no],
       [gl_cv_header_errno_h_complete=yes])