From 8ac9edd1a71fe24ed94d70f1669e4fd6a81fa585 Mon Sep 17 00:00:00 2001
From: Christian Feld <c.feld@fz-juelich.de>
Date: Thu, 20 Nov 2025 08:14:01 -0800
Subject: [PATCH] Fix bug in Fortran implicit int handling

* lib/autoconf/fortran.m4 (_AC_FC_IMPLICIT_NONE):
Fix typo in argument numbering.
Copyright-paperwork-exempt: yes
---
 lib/autoconf/fortran.m4 | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/autoconf/fortran.m4 b/lib/autoconf/fortran.m4
index 4c39607c..09459f07 100644
--- a/lib/autoconf/fortran.m4
+++ b/lib/autoconf/fortran.m4
@@ -1665,13 +1665,13 @@ rm -f conftest.err conftest.$ac_objext conftest.$ac_ext
 _AC_LANG_PREFIX[]FLAGS=$ac_fc_implicit_none_[]_AC_LANG_PREFIX[]FLAGS_save
 ])
 if test "x$ac_cv_[]_AC_LANG_ABBREV[]_implicit_none" = xunknown; then
-  m4_default([$3],
+  m4_default([$2],
     [AC_MSG_ERROR([no Fortran flag to disallow implicit declarations found], 77)])
 else
   if test "x$ac_cv_[]_AC_LANG_ABBREV[]_implicit_none" != xnone; then
     _AC_LANG_PREFIX[]FLAGS="$_AC_LANG_PREFIX[]FLAGS $ac_cv_[]_AC_LANG_ABBREV[]_implicit_none"
   fi
-  $2
+  $1
 fi
 ])# _AC_FC_IMPLICIT_NONE