Hey, you fixed it (sort of)! I tried your suggestions but diverted a little bit. Basically here's what happened:
* depclean did nothing (except remove a few Thunderbird dependencies I actually needed, whoops) * `revdep-rebuild` also found nothing * `ldd` gave /lib/libz.so.1.2.11 * I noticed that /usr/lib/libz.so.1.2.7 existed as well and proceeded to delete it * Re-emerged both libz and libpng, Thunderbird build still failed * Decided "let's delete /lib/libz.so.1.2.11 as well" (bad idea I know, I just barely recovered from that) * After replacing libz from the stage3 tarball, re-emerged libz Aaaand then it just worked, I must admit I'm not entirely sure why ¯\_(ツ)_/¯ Anyways, thanks for taking the time to support me here! -- Regards, Christoph
