Homebrew formula for grace

grace.rb

require 'formula'

class Grace < Formula
  url 'ftp://plasma-gate.weizmann.ac.il/pub/grace/src/stable/grace-5.1.22.tar.gz'
  homepage 'http://plasma-gate.weizmann.ac.il/Grace/'
  md5 '672356466f18fe59ed21a8fb44f9851d'

  depends_on 'lesstif'

  def patches
    { :p0 => DATA }
  end

  def install
    ENV.x11 # enable libpng support
    system "./configure", "--disable-debug", "--disable-dependency-tracking",
                          "--prefix=#{prefix}"
    system "make install"
  end

  def test
    # this will fail we won't accept that, make it test the program works!
    system "/usr/bin/false"
  end
end

__END__
patch for libpng 1.5 as described by https://github.com/mxcl/homebrew/pull/6903

--- src/rstdrv.c.orig
+++ src/rstdrv.c
@@ -54,6 +54,7 @@
 
 #ifdef HAVE_LIBPNG
 #  include <png.h>
+#  include <zlib.h>
 #endif
 
 #ifndef NONE_GUI
@@ -885,7 +886,7 @@ static void rstImagePng(gdImagePtr ihandle, FILE *prstream)
         return;
     }
 
-    if (setjmp(png_ptr->jmpbuf)) {
+    if (setjmp(png_jmpbuf(png_ptr))) {
         png_destroy_write_struct(&png_ptr, &info_ptr);
         return;
     }