1 files changed, 18 insertions, 2 deletions

diff --git a/gl/m4/langinfo_h.m4 b/gl/m4/langinfo_h.m4
index 5eee8a71..69f936f0 100644
--- a/gl/m4/langinfo_h.m4
+++ b/gl/m4/langinfo_h.m4
@@ -1,9 +1,10 @@
 # langinfo_h.m4
-# serial 12
-dnl Copyright (C) 2009-2024 Free Software Foundation, Inc.
+# serial 13
+dnl Copyright (C) 2009-2025 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_DEFUN_ONCE([gl_LANGINFO_H],
 [
@@ -19,6 +20,7 @@ AC_DEFUN_ONCE([gl_LANGINFO_H],
   HAVE_LANGINFO_CODESET=0
   HAVE_LANGINFO_T_FMT_AMPM=0
   HAVE_LANGINFO_ALTMON=0
+  HAVE_LANGINFO_ABALTMON=0
   HAVE_LANGINFO_ERA=0
   HAVE_LANGINFO_YESEXPR=0
   AC_CHECK_HEADERS_ONCE([langinfo.h])
@@ -29,6 +31,7 @@ AC_DEFUN_ONCE([gl_LANGINFO_H],
     dnl ERA etc. are missing on OpenBSD 6.7.
     dnl T_FMT_AMPM and YESEXPR, NOEXPR are missing on IRIX 5.3.
     dnl ALTMON_* are missing on glibc 2.26 and many other systems.
+    dnl ABALTMON_* are missing on glibc 2.41 and many other systems.
     AC_CACHE_CHECK([whether langinfo.h defines CODESET],
       [gl_cv_header_langinfo_codeset],
       [AC_COMPILE_IFELSE(
@@ -65,6 +68,18 @@ int a = ALTMON_1;
     if test $gl_cv_header_langinfo_altmon = yes; then
       HAVE_LANGINFO_ALTMON=1
     fi
+    AC_CACHE_CHECK([whether langinfo.h defines ABALTMON_1],
+      [gl_cv_header_langinfo_abaltmon],
+      [AC_COMPILE_IFELSE(
+         [AC_LANG_PROGRAM([[#include <langinfo.h>
+int a = ABALTMON_1;
+]])],
+         [gl_cv_header_langinfo_abaltmon=yes],
+         [gl_cv_header_langinfo_abaltmon=no])
+      ])
+    if test $gl_cv_header_langinfo_abaltmon = yes; then
+      HAVE_LANGINFO_ABALTMON=1
+    fi
     AC_CACHE_CHECK([whether langinfo.h defines ERA],
       [gl_cv_header_langinfo_era],
       [AC_COMPILE_IFELSE(
@@ -96,6 +111,7 @@ int a = YESEXPR;
   AC_SUBST([HAVE_LANGINFO_CODESET])
   AC_SUBST([HAVE_LANGINFO_T_FMT_AMPM])
   AC_SUBST([HAVE_LANGINFO_ALTMON])
+  AC_SUBST([HAVE_LANGINFO_ABALTMON])
   AC_SUBST([HAVE_LANGINFO_ERA])
   AC_SUBST([HAVE_LANGINFO_YESEXPR])