visionmedia/git-extras — pull request #104 by wilmoore (2012-05-31 04:49:02+00:00)
Title: Corrected `git extras update` where ${PREFIX} was not honored for `make install`

- query for $PREFIX given location of `git-extras` script
- prefix `make install` with ${PREFIX} -- empty is given if $PREFIX not
set allowing makefile to continue to use it's default in that case.