Date: 2015年6月28日 16:22:45 +0200 From: Benny Siegert <bsiegert%gmail.com@localhost> I just learned about "System Integrity Protection", which is a feature in the next Mac OS version: http://apple.stackexchange.com/questions/193368/what-is-the-rootless-feature-in-el-capitan-really/193379#193379 Apparently even root now cannot modify /usr, except for /usr/local. This sounds like a challenge for pkgsrc, given the default /usr/pkg prefix. Ideas? We could always just make the default prefix be /usr/local/pkg instead of /usr/pkg on OS X.