GitHub is home to over 20 million developers working together to host and review code, manage projects, and build software together.
I'm seeing exactly the same issue as described here on Stackoverflow. I'm trying to build Cairo and Pixman as described in issue #20. Pixman previously built correctly for me but now hangs. I can log on to the dyno and build it manually using /bin/make but I'm not sure what else to test.
I've been working on a build system called anvil and I think it may be better suited for these types of builds.
Here's a sample build of memcached using anvil:
$ heroku build http://memcached.googlecode.com/files/memcached-1.4.13.tar.gz -b https://raw.github.com/ddollar/vulcan-recipes/master/memcached.sh
Note that you give it a source tarball and a shell script to run. Anything that you leave in the /app directory will be scooped up into the "slug"
Give this a shot and let me know if it works for you. Feel free to grab me as ddollar on Freenode if you want something a bit more interactive.