MacOS Compatibility

[dellelce]

By default MacOS does not have:

• recent version of bash
• GNU AWK
• GNU sed
• wget

The GNU Linker is not available on MacOS: LDFLAGS must be modified

[dellelce]

LLVM/Clang compatibility issues:

When building the GPAW which includes Python and libffi, the build fails :

$ ls -1d mkit_workdir/downloads/libffi-3.4.5.tar.gz
mkit_workdir/downloads/libffi-3.4.5.tar.gz
$ md5sum mkit_workdir/downloads/libffi-3.4.5.tar.gz
cea8d9ea4dc191481a3d56feb5a80937  mkit_workdir/downloads/libffi-3.4.5.tar.gz

libffi 3.4.5 build issue:
libffi/libffi#852

===

The detected "3.4.5 version is from February 2024, the srcget filter needs to be updated to github

[dellelce]

the following commits add support for macOS linker 04f0315