Created attachment 127763 [details]
Crash Dump from XQuartz
XQuartz v. 2.7.11 crashes on start-up on Mac Pro running Mac OS X v. 10.12.1 (Sierra). The crash dump has been attached.
This is behaving correctly. You've instructed dyld to use your libraries in DYLD_LIBRARY_PATH instead of the ones we ship, and the crash happened because of your libraries. dyld now does a great job of pointing out where you've shot yourself in the foot:
Don't do that! Don't set DYLD_LIBRARY_PATH unless you really understand what it's doing. If someone told you to use DYLD_LIBRARY_PATH, go tell them they were wrong.
Thanks so much for this fix, you are 100% correct.