mxcl/homebrew — pull request #13163 by 2bits (2012-07-02 10:10:06+00:00)
Title: jpeg-turbo: fix race condition in make install

jpeg-turbo-1.2.0 can fail `make install` due to a race condition
on Lion using clang, where you get the error that a path exists.
Separate the make steps, and deparallelize the install.