m4/mdw-decl-environ.m4: Add missing m4 quoting.

diff --git a/m4/mdw-decl-environ.m4 b/m4/mdw-decl-environ.m4
index a089f610b0bb74e013d2b8e594b740bd77969b18..581c0c0f20c9415d864b2b3d0f878e0b2ba29612 100644 (file)
--- a/m4/mdw-decl-environ.m4
+++ b/m4/mdw-decl-environ.m4
@@ -41,7 +41,7 @@ dnl -*-autoconf-*-
 
 # serial 1
 AC_DEFUN([mdw_DECL_ENVIRON],
-[AC_CACHE_CHECK([for declaration of `environ'], mdw_cv_environ,
+[AC_CACHE_CHECK([for declaration of `environ'], [mdw_cv_environ],
 [AC_EGREP_CPP([\<environ\>],
 [#include <sys/types.h>
 #if HAVE_UNISTD_H