Auto merge of #1819 - alexcrichton:fix-no-pkg-config, r=alexcrichton
authorbors <bors@rust-lang.org>
Mon, 20 Jul 2015 23:05:33 +0000 (23:05 +0000)
committerbors <bors@rust-lang.org>
Mon, 20 Jul 2015 23:05:33 +0000 (23:05 +0000)
Contains a fix for building on systems where pkg-config isn't installed.

Closes #1727


Trivial merge