Building Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1b4pre) Gecko/20090416 Lightning/1.0pre Shredder/3.0b3pre from Mercurial on ArchLinux with Pango 1.24.0-2 worked with the patch for me as well.
Building Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1b4pre) Gecko/20090416 Lightning/1.0pre Shredder/3.0b3pre from Mercurial on ArchLinux with Pango 1.24.0-2 worked with the patch for me as well.