diff --git a/configuration/include/ac_check_envvar.m4 b/configuration/include/ac_check_envvar.m4
index 164fd5c..e041db3 100755
--- a/configuration/include/ac_check_envvar.m4
+++ b/configuration/include/ac_check_envvar.m4
@@ -9,10 +9,10 @@
 dnl
 
 AC_DEFUN([AC_CHECK_ENVVAR],[dnl
-AC_MSG_CHECKING([$1])
+AC_MSG_CHECKING([variable $1])
 if test -z @S|@$1; then
 	AC_MSG_RESULT([no])
-	AC_MSG_WARN([required environment variable $1 not defined])
+	AC_MSG_WARN([environment variable $1 not defined])
 else
 	AC_MSG_RESULT([@S|@$1])
 fi