I posted recently about XQuartz causing compile errors related to libpng. The problem was likely not due to a problem in XQuartz

It wasn't.  Your application either doesn't work with the 1.4 SDK or was incorrectly including the SDK.

You're right. It is a problem with the app.

I am simply asking if something changed in the most recent release with respect to libpng (rc1 versus the previous betas). Thats all. I am not trying to blame XQuartz, or trying to say there's a problem with it. I'm just trying to understand what changed in the most recent release, if anything.

Dave