--- mc/configure.ac.orig	2008-06-11 23:37:55 +0600
+++ mc/configure.ac	2008-08-06 01:38:40 +0600
@@ -14,10 +14,7 @@ AM_MAINTAINER_MODE
 
 AC_CANONICAL_HOST
 
-AC_GNU_SOURCE
-AC_AIX
-AC_MINIX
-AC_ISC_POSIX
+AC_USE_SYSTEM_EXTENSIONS
 
 AC_PROG_CC_STDC