molmol @2k.2.0: No rule to make target `/usr/lib/libz.dylib', needed by `molmol'. Stop.

[ryandesign (Ryan Carsten Schmidt)]

molmol does not build on macOS 11 or later:

​https://build.macports.org/builders/ports-11_arm64-builder/builds/20187/steps/install-port/logs/stdio

make[4]: *** No rule to make target `/usr/lib/libz.dylib', needed by `molmol'.  Stop.

System libraries like /usr/lib/libz.dylib are not present in the filesystem anymore as of macOS 11. They are only in the dylib cache, so you can dlopen them, but you cannot do things like use them as depenencies in makefile rules anymore.

molmol shouldn't be using /usr/lib/libz.dylib anyway. It should use MacPorts zlib.

[jwhowarth]

In 21f3ef5fa4aa2187c070c1d15428338dad2b5fee/macports-ports (master):

molmol: fix build on Big Sur

• using MacPorts zlib and removing deprecated OpenGL framework linkage
• modernize checksums
• add license

Closes: #62865