--- a/ChangeLog	Sun Jan 06 20:53:44 2019 +0100
+++ b/ChangeLog	Sun Jan 06 21:22:38 2019 +0100
@@ -1,3 +1,9 @@
+2019-01-06  Bruno Haible  <bruno@clisp.org>
+
+	localename: Assume setlocale function.
+	* lib/localename.c (gl_locale_name_posix): Assume setlocale exists.
+	* m4/localename.m4 (gl_LOCALENAME): Don't test whether setlocale exists.
+
 2019-01-06  Bruno Haible  <bruno@clisp.org>
 
 	doc: Add documentation about container data types.

--- a/lib/localename.c	Sun Jan 06 20:53:44 2019 +0100
+++ b/lib/localename.c	Sun Jan 06 21:22:38 2019 +0100
@@ -3269,7 +3269,7 @@
 
     /* Use the POSIX methods of looking to 'LC_ALL', 'LC_xxx', and 'LANG'.
        On some systems this can be done by the 'setlocale' function itself.  */
-#if defined HAVE_SETLOCALE && defined HAVE_LC_MESSAGES && defined HAVE_LOCALE_NULL
+#if defined HAVE_LC_MESSAGES && defined HAVE_LOCALE_NULL
     locname = setlocale (category, NULL);
 #else
     /* On other systems we ignore what setlocale reports and instead look at the

--- a/m4/localename.m4	Sun Jan 06 20:53:44 2019 +0100
+++ b/m4/localename.m4	Sun Jan 06 21:22:38 2019 +0100
@@ -1,4 +1,4 @@
-# localename.m4 serial 5
+# localename.m4 serial 6
 dnl Copyright (C) 2007, 2009-2019 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -11,7 +11,6 @@
   AC_REQUIRE([gt_INTL_THREAD_LOCALE_NAME])
   AC_REQUIRE([gt_INTL_MACOSX])
   AC_CHECK_HEADERS_ONCE([langinfo.h])
-  AC_CHECK_FUNCS([setlocale])
   AC_CHECK_FUNCS_ONCE([newlocale duplocale freelocale])
   if test $ac_cv_func_newlocale != yes; then
     HAVE_NEWLOCALE=0