When I compile a C-library in debug mode I get the following error when starting an application that uses that library: dyld[63669]: Library not loaded: /usr/local/lib/librslib_debug.dylib   Referenced from: /Users/moreelsj/Library/Developer/Xcode/DerivedData/gproc-alhokhuzgxjwanctopctgrsmqauc/Build/Products/Debug/corg   Reason: tried: '/Users/moreelsj/Library/Developer/Xcode/DerivedData/gproc-alhokhuzgxjwanctopctgrsmqauc/Build/Products/Debug/librslib_debug.dylib' (no such file), '/usr/lib/system/introspection/librslib_debug.dylib' (no such file), '/usr/local/lib/librslib_debug.dylib' (code signature does not cover entire file up to signature), '/usr/lib/librslib_debug.dylib' (no such file) The application works when I use the same library compiled in release mode. The problem appeared when I changed the library and recompiled it. There was no problem using the older debug version of that library. I recently upgraded both the OS (12.2) and Xcode