--- a/tool/mkconfig.rb  2013-07-25
+++ b/tool/mkconfig.rb  2013-07-25
@@ -130,6 +130,8 @@
       val = "(TOPDIR || DESTDIR + #{val})"
     when /^ARCH_FLAG$/
       val = "arch_flag || #{val}" if universal
+    when /^CC$/
+      val = "ENV[\"CC\"] || #{val}"
     when /^UNIVERSAL_ARCHNAMES$/
       universal, val = val, 'universal' if universal
     when /^arch$/