It's not the symlink that's the problem. It's the dylib version. It would work as intended if it had a current version of 8.0.0 and a compat version of 7.0.0. Thanks for catching this. Please file a ticket. As mentioned before, the entire problem with the 2.7.9 solution was that we can't have two different copies of libXt in the same process because the dependents don't necessarily respect layering. I'll drop in a stub for libXt.7.dylib which re-exports libXt.6.dylib with the appropriate versioning.

On Sep 24, 2016, at 17:23, Jack Howarth <howarth.mailing.lists@gmail.com> wrote:

Jeremy, You have a major thinko in XQuartz 2.7.10-rc2. Replacing libXt.7.dylib with a symlink to libXt.6.dylib causes all binaries built against XQuartz 2.7.9 to break....

dyld: Library not loaded: /opt/X11/lib/libXt.7.dylib Referenced from: /sw/bin/gs Reason: Incompatible library version: gs requires version 8.0.0 or later, but libXt.7.dylib provides version 7.0.0

because the libXt.7.dylib in the current 2.7.9 release has an so version of 8.0.0. You will need to replace the symlink with a proper build of libXt.7.dylib to provide continuity in the so version number. Jack