--- graphviz-2.30.1/configure.ac.orig	2013-07-18 00:11:31.511494891 +0200
+++ graphviz-2.30.1/configure.ac	2013-07-18 00:11:34.631470248 +0200
@@ -1542,7 +1542,7 @@
     if test `$SWIG -help 2>&1 | $EGREP -c '\-ruby *- Generate'` == 0; then
       use_ruby="No (swig does not support -ruby option)"
     else
-      PKG_CHECK_MODULES([RUBY], [ruby],[
+      PKG_CHECK_MODULES([RUBY], [ruby-2.0],[
 	AC_CHECK_PROG(RUBY,ruby,ruby)
         if test "x$RUBY" == "x"; then
           use_ruby="No (ruby not available)"