When using mex files, cannot find libraries

Question

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I created a mex function which uses another library that relies on gfortran. However, when I execute the function, I see this error message

Library not loaded: /usr/local/lib/libgfortran.1.dylib

I do have this library, but it's just in a different folder called /usr/local/gfortran/lib, so I did this to fix the issue

setenv('DYLD_LIBRARY_PATH', '/usr/local/gfortran/lib');

This doesn't fix it at all. I still see the same issue. Is there a way to force the library to look for gfortran in this specific path that I specified?

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Walter Roberson 2018-1-9

Which operating system are you using, and which release? DYLD_LIBRARY_PATH suggests OS-X or MacOS, but there were security changes to how DYLD_LIBRARY_PATH is processed in recent Apple releases.