mxcl/homebrew — pull request #20003 by springmeyer (2013-05-22 23:26:12+00:00)
Title: Ensure that mapnik's postgres support (postgis.input) links to correct libpg

Without this change Mapnik's postgis.input plugin will end up linking to the apple provided `/usr/lib/libpg.5.dylib`, which will cause all sorts of odd and broken behavior at runtime.