matplotlib/matplotlib — pull request #2623 by efiring (2013-11-28 20:15:26+00:00)
Title: setupext: put pkg-config -I, -L, -l locations at the head of the list

This addresses #2622.
The assumption here is that we want the pkg-config info to take
precedence, so its -I and -L output should be prepended, not
appended to the lists used to construct the compiler and linker
commands. It is less clear whether the -l info also should
be prepended, as it is in the changeset; ideally, it wouldn't
matter, but for some compilers, it might. If so, -l can
be handled separately from -I and -L.