There is some history to this problem.

I was able to call dylib with MACOS Catalina using HPC gfortran to compile and link.

Under BIG SUR, I was unable to call dylibs using gfortran to link, but succeeded in calling one of several dylibs linked by clang. The behavior is inconsistent.

Now attempting to compile and link on a MacBookPro M4 using HPC gfortran binary to compile and link with either gfortran or clang but so far have no luck. Using the same location /Library/Application Support/Microsoft/

Using install_name_tool to change dylib id. See below. This used to work well, but no more with Sequoia 15.3.1.

Will continue with this effort.

    install_name_tool -id /Library/ApplicationSupport/Microsoft/libmydylib.dylib libmydylib.dylib