--- m4-1.4.18/tests/localename.c.old	2016-12-31 13:54:43.000000000 +0000
+++ m4-1.4.18/tests/localename.c	2017-07-30 16:40:47.098541270 +0000
@@ -40,7 +40,7 @@
 # if defined __APPLE__ && defined __MACH__
 #  include <xlocale.h>
 # endif
-# if __GLIBC__ >= 2 && !defined __UCLIBC__
+# if defined __linux__
 #  include <langinfo.h>
 # endif
 # if !defined IN_LIBINTL
@@ -2692,16 +2692,19 @@
     locale_t thread_locale = uselocale (NULL);
     if (thread_locale != LC_GLOBAL_LOCALE)
       {
-#  if __GLIBC__ >= 2 && !defined __UCLIBC__
+#  if defined(_NL_LOCALE_NAME)
+        const char *name = nl_langinfo(_NL_LOCALE_NAME(category));
+#   if __GLIBC__ >= 2 && !defined __UCLIBC__
         /* Work around an incorrect definition of the _NL_LOCALE_NAME macro in
            glibc < 2.12.
            See <http://sourceware.org/bugzilla/show_bug.cgi?id=10968>.  */
-        const char *name =
-          nl_langinfo (_NL_ITEM ((category), _NL_ITEM_INDEX (-1)));
+	if (name[0] == '\0')
+          name = nl_langinfo (_NL_ITEM ((category), _NL_ITEM_INDEX (-1)));
         if (name[0] == '\0')
           /* Fallback code for glibc < 2.4, which did not implement
              nl_langinfo (_NL_LOCALE_NAME (category)).  */
           name = thread_locale->__names[category];
+#   endif
         return name;
 #  elif defined __FreeBSD__ || (defined __APPLE__ && defined __MACH__)
         /* FreeBSD, Mac OS X */