Regarding the built-in image libs: I think Manolo changed the default in CMake builds for png and jpeg to built-in on macOS (e.g. OPTION_USE_SYSTEM_LIBJPEG "use system libjpeg" OFF) but left zlib ON (i.e. system) which I found this way on my macOS CMake build. It seemed to work but I switched zlib to OFF manually as well for consistency. I can't tell what the defaults for configure/make are.

Perhaps this should be the default on OSX, just so a simple default build works?

I think this depends on our bundled library versions and the existing header files on the system. It's a well-known problem that not all combinations work well - and under Linux we have another issue that (IIRC) is required and linked to the system Xft shared lib which makes it impossible to use our bundled libpng, or something like that...

One of my next points on my to-do-list is to update the bundled libs but I can't tell if this makes a difference (very likely it will).

For users it would probably be the best to switch either all bundled libs ON or all libs OFF for consistency and likely the best results.

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