diff -r a103abae1560 -r 1d6fd9bde73c kconfig/symbol.c
--- a/kconfig/symbol.c	Sun May 08 14:14:40 2011 +0200
+++ b/kconfig/symbol.c	Wed Dec 26 20:05:19 2012 +0100
@@ -1255,6 +1255,4 @@
 	p = getenv(env);
 	if (p)
 		sym_add_default(sym, p);
-	else
-		menu_warn(current_entry, "environment variable %s undefined", env);
 }