I posted recently about XQuartz causing compile errors related to libpng. The 
problem was likely not due to a problem in XQuartz, but the installation 
triggered  a mismatch in libpng versions. I didn't have any user-installed 
libpng files when the errors occurred, and the cause was a mystery. My only 
solution was to install my own libpng into /usr/local and prune out the ones in 
/opt/X11. This is what I have been doing for the last few revs. Each time I 
installed XQuartz the problem came back until I pruned them out.

I want to report that  XQuartz 2.6.1_rc1 does not have this problem. I 
installed it and repeated my test of compiling an X11 app that requires libpng. 
I expected errors, and expected to prune out /opt/X11 again. But this time the 
apps compiled without error.

Did something change in  XQuartz 2.6.1_rc1 with regards to libpng? .pc files?

Whatever it was, it's working now.

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