milkypostman/powerline — pull request #48 by DanielMe (2013-10-13 22:23:01+00:00)
Title: adding a (require 'color) to the powerline-separators.

I tried to byte-compile the powerline library which failed on my machine due to missing references to the color.el.
I managed to get it to work by adding an explicit (require 'color) to the powerline-seperators.el.
However I am not sure whether that will cause issues on pre 24 emacs versions.