Comment 5 for bug 536161

With a lots of help and discussion with aber and janus on #widelands.de IRC Channel, we found the following so far:

This problem seems to be only valid for Gentoo (and possibly derivates), as there has been effort to rename the OF macro in zlib.h to Z_OF.

This change is heavily discussed and in my eyes, to make this change without even a warning/deprecation period, is slightly disturbing. You can see for yourself: https://bugs.gentoo.org/show_bug.cgi?id=383179

I don't know if the zlib people plan to do this in the future, too... at least they seem to think about it: http://mail.madler.net/pipermail/zlib-devel_madler.net/2011-September/002621.html