* mkconfig.rb: typo.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@1454 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

mkconfig.rb

@@ -48,7 +48,7 @@ File.foreach "config.status" do |line|
       v_others << v
     end
     has_version = true if name == "MAJOR"
-  elsif /^(?:ac_given_)srcdir=(.*)/ =~ line
+  elsif /^(?:ac_given_)?srcdir=(.*)/ =~ line
     v_fast << "  CONFIG[\"srcdir\"] = \"" + File.expand_path($1) + "\"\n"
     has_srcdir = true
   elsif /^ac_given_INSTALL=(.*)/ =~ line