Brandon Allbery wrote on 02.10.2015 15:52:
Dependencies. Port X compiles against new libSystem, depends on port Y
that was linked against old libSystem, link fails because it tries to
bring in both versions and they conflict. (Keeping around old libSystem
versions is how you can still run applications built for 10.5 on
10.10/10.11.)
This doesn't happen on Linux because glibc is obsessive about
maintaining backward compatibility interfaces, so the older program
links against the current glibc and uses compatibility interfaces from
it; this works even for libraries. Apple doesn't care about backward
compatibility enough to do things that way.
Thanks for this detailed answer. I might have been somewhat rude because
I just didn't fully understand what the problem is. One reason I don't
like the idea of recompiling everything is time, the other one being
that I did some things to integrate macports into my system, like
setting my shell to its bash and prefering it in /etc/paths, probably
some other things I don't remember yet. I just wanted to avoid some trouble.
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