If I use both the --libs-only-L and --libs-only-l options, the -L results are not included. Tested on ubuntu 12.04 and 14.04.
Looks like this was fixed a few years ago in version 0.28: https://bugs.freedesktop.org/show_bug.cgi?id=54388 Ubuntu 14.04's version of pkg-config was based on 0.26, though 15.04's version is based on 0.28. *** This bug has been marked as a duplicate of bug 54388 ***
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