geda-gaf: fix compiling against glib 2.32 and add --devel

Formula/geda-gaf.rb

@@ -1,20 +1,30 @@
 require 'formula'
 
 class GedaGaf < Formula
-  url 'http://geda.seul.org/release/v1.6/1.6.2/geda-gaf-1.6.2.tar.gz'
   homepage 'http://geda.seul.org'
+  url 'http://geda.seul.org/release/v1.6/1.6.2/geda-gaf-1.6.2.tar.gz'
   md5 '35ae86aebc174ec1fc03863fde4c843c'
 
+  devel do
+    url 'http://geda.seul.org/devel/v1.7/1.7.2/geda-gaf-1.7.2.tar.gz'
+    md5 'ccfe334e333d6ed14ace22a43c2cdc7c'
+  end
+
   depends_on 'pkg-config' => :build
   depends_on 'gettext'
   depends_on 'gtk+'
   depends_on 'guile'
   depends_on 'gawk'
 
+  # MacPorts fix for glib 2.32 includes
+  # Needed for 1.6.2 and 1.7.x
+  def patches
+    {:p0 => ["https://trac.macports.org/export/92743/trunk/dports/science/geda-gaf/files/patch-glib-2.32.diff"]}
+  end
+
   def install
     # Help configure find libraries
     ENV.x11
-
     gettext = Formula.factory('gettext')
 
     system "./configure", "--prefix=#{prefix}",