Workaround for "Library not loaded: @rpath/libc++.1.dylib" when open MEGAlib programs with macports

[zoglauer]

When loading any MEGAlib program, the following error message appears with the latest macports

dyld[95927]: Library not loaded: @rpath/libc++.1.dylib
Referenced from: <739C2A19-DB87-37C1-9B99-034B7CA3E980> /opt/local/lib/libhealpix_cxx.3.dylib
Reason: tried: '/Users/andreas/Documents/Science/Software/COSItools/external/root_v6.34.8/lib/libc++.1.dylib' (no such file), '/Users/andreas/Documents/Science/Software/COSItools/megalib/lib/libc++.1.dylib' (no such file), '/Users/andreas/Documents/Science/Software/COSItools/megalib/lib/libc++.1.dylib' (no such file), '/Users/andreas/Documents/Science/Software/COSItools/external/geant4_v11.2.2/lib/Geant4-11.2.2/../libc++.1.dylib' (no such file), '/Users/andreas/Documents/Science/Software/COSItools/external/root_v6.34.8/lib/libc++.1.dylib' (no such file), '/Users/andreas/Documents/Science/Software/COSItools/megalib/lib/libc++.1.dylib' (no such file), '/Users/andreas/Documents/Science/Software/COSItools/external/geant4_v11.2.2/lib/Geant4-11.2.2/../libc++.1.dylib' (no such file), '/libc++.1.dylib' (no such file), '/opt/local/libexec/llvm-16/lib/libc++.1.dylib' (no such file), '/System/Volumes/Preboot/Cryptexes/OS/opt/local/libexec/llvm-16/lib/libc++.1.dylib' (no such file), '/Users/andreas/Documents/Science/Software/COSItools/external/root_v6.34.8/lib/libc++.1.dylib' (no such file), '/System/Volumes/Preboot/Cryptexes/OS/Users/andreas/Documents/Science/Software/COSItools/external/root_v6.34.8/lib/libc++.1.dylib' (no such file), '/opt/local/lib/libc++.1.dylib' (no such file), '/System/Volumes/Preboot/Cryptexes/OS/opt/local/lib/libc++.1.dylib' (no such file), '/Users/andreas/Documents/Science/Software/COSItools/external/root_v6.34.8/lib/libc++.1.dylib' (no such file), '/System/Volumes/Preboot/Cryptexes/OS/Users/andreas/Documents/Science/Software/COSItools/external/root_v6.34.8/lib/libc++.1.dylib' (no such file), '/opt/local/lib/libc++.1.dylib' (no such file), '/System/Volumes/Preboot/Cryptexes/OS/opt/local/lib/libc++.1.dylib' (no such file), '/Users/andreas/Documents/Science/Software/COSItools/external/root_v6.34.8/lib/libc++.1.dylib' (no such file), '/System/Volumes/Preboot/Cryptexes/OS/Users/andreas/Documents/Science/Software/COSItools/external/root_v6.34.8/lib/libc++.1.dylib' (no such file), '/opt/local/lib/libc++.1.dylib' (no such file), '/System/Volumes/Preboot/Cryptexes/OS/opt/local/lib/libc++.1.dylib' (no such file)

[zoglauer]

This is a new macports problem in connection with libhealpix-cxx:

Here is a workaround:

1. Install clang-14
   sudo port install clang-14

2. Link the files
   cd /opt/local/lib
   sudo ln -s ../libexec/llvm-14/lib/libc++/libc++.1.dylib libc++.1.dylib
   sudo ln -s ../libexec/llvm-14/lib/libc++/libc++abi.1.dylib libc++abi.1.dylib