X-Git-Url: https://git.cworth.org/git?p=tar;a=blobdiff_plain;f=m4%2Ffnmatch.m4;fp=m4%2Ffnmatch.m4;h=84bcabd9ff122254a55cad66724ec8183e27bff8;hp=212ead57291fe6fcb88929b91250c891de3b012f;hb=ee168310ec4227174ace489bf5f81f8c2f91cde0;hpb=22f1eb8bc17e5be72dd23d42d6aaa60196ac22e6

diff --git a/m4/fnmatch.m4 b/m4/fnmatch.m4
index 212ead5..84bcabd 100644
--- a/m4/fnmatch.m4
+++ b/m4/fnmatch.m4
@@ -20,7 +20,9 @@ AC_DEFUN([gl_FUNC_FNMATCH_POSIX],
   AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
 
   FNMATCH_H=
-  gl_fnmatch_required_lowercase=`echo $gl_fnmatch_required | tr 'A-Z' 'a-z'`
+  gl_fnmatch_required_lowercase=`
+    echo $gl_fnmatch_required | tr '[[A-Z]]' '[[a-z]]'
+  `
   gl_fnmatch_cache_var="gl_cv_func_fnmatch_${gl_fnmatch_required_lowercase}"
   AC_CACHE_CHECK([for working $gl_fnmatch_required fnmatch],
     [$gl_fnmatch_cache_var],