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https://bugzilla.redhat.com/show_bug.cgi?id=697836
--- Comment #5 from Volker Fröhlich volker27@gmx.at 2011-05-14 09:44:06 EDT --- Replacing "-lz" with "-Wl,--as-needed -lz" proves right: zlib is unnecessary. You can drop from the BRs and remove it from the Makefile.