Invalid MEX-file: Library not loaded: @rpath/lib​MatlabEngi​ne.dylib

I wrote a C++ function that I'd like to execute in Matlab via mex. When I compile it:

>> mex kernels/string/ssk.cpp -outdir kernels/string/
Building with 'Xcode Clang++'.
ld: warning: -undefined error is deprecated
ld: warning: -undefined error is deprecated

MEX completed successfully.

it seems to work. However upon execution I get:

---------
    Error ID:
    ---------
    'MATLAB:mex:ErrInvalidMEXFile'
    --------------
    Error Details:
    --------------
    Invalid MEX-file '/Users/matthias/Documents/uni/Bachelor Thesis/kMRCD/kernels/string/ssk.mexmaci64': dlopen(/Users/matthias/Documents/uni/Bachelor
    Thesis/kMRCD/kernels/string/ssk.mexmaci64, 0x0006): Library not loaded: @rpath/libMatlabEngine.dylib
      Referenced from: <E31D1387-76D0-3FBE-8950-A48189E53ECF> /Users/matthias/Documents/uni/Bachelor Thesis/kMRCD/kernels/string/ssk.mexmaci64
      Reason: tried: '/Applications/MATLAB_R2023b.app/bin/maci64/libMatlabEngine.dylib' (no such file),
      '/Applications/MATLAB_R2023b.app/bin/maci64/./libMatlabEngine.dylib' (no such file),
      '/Applications/MATLAB_R2023b.app/bin/maci64/../../sys/os/maci64/libMatlabEngine.dylib' (no such file),
      '/Applications/MATLAB_R2023b.app/bin/maci64/libMatlabEngine.dylib' (no such file), '/Applications/MATLAB_R2023b.app/bin/maci64/./libMatlabEngine.dylib' (no such
      file), '/Applications/MATLAB_R2023b.app/bin/maci64/../../sys/os/maci64/libMatlabEngine.dylib' (no such file),
      '/Applications/MATLAB_R2023b.app/bin/maci64/../../runtime/maci64/libMatlabEngine.dylib' (no such file),
      '/Applications/MATLAB_R2023b.app/bin/maci64/../../sys/java/jre/maci64/jre/lib/server/libMatlabEngine.dylib' (no such file),
      '/Applications/MATLAB_R2023b.app/bin/maci64/../../sys/java/jre/maci64/jre/lib/libMatlabEngine.dylib' (no such file)      

when I look for the missing file:

> find /Applications/MATLAB_R2023b.app -name "libMatlabEngine.dylib"                                                                                                                                           [091114b]
/Applications/MATLAB_R2023b.app/extern/bin/maci64/libMatlabEngine.dylib

I find it. I also set my DYLD_LIBRARY_PATH:

> echo $DYLD_LIBRARY_PATH
/Applications/MATLAB_R2023b.app/runtime/maci64:/Applications/MATLAB_R2023b.app/bin/maci64:/Applications/MATLAB_R2023b.app/sys/os/maci64:/Applications/MATLAB_R2023b.app/extern/bin/maci64

but it still can't find it...

I found this question: https://www.mathworks.com/matlabcentral/answers/2044762-why-do-i-receive-a-library-not-loaded-rpath-libmatlabengine-dylib-error-when-running-a-mex-funct that references some archive with correct options which I can't find.

[Gowtham]

Hi Matthias,

Please find the External Bug Report which contains the required zip archive at https://www.mathworks.com/support/bugreports/details/3138142

Alternatively, it is recommended to update MATLAB to R2023b Update 5, which should also resolve the issue.