Why is this present in the cmake/install file?

[MoBaT]

Hey! I'm currently on a Mac machine and am building protobuf through ExternalProject_Add. My main project modifies the CMAKE_INSTALL_LIBDIR, so ideally I would love that propagated to the protoc executable instead of it being a hardcoded @loader_path/../lib. My question is, what is the purpose of this cmake code? Why is it hardcoded for mac machines?

https://github.com/protocolbuffers/protobuf/blob/main/cmake/install.cmake#L77

In my application, I had to patch the protobuf repository to revert it back to use @loader_path/../${CMAKE_INSTALL_LIBDIR} instead of the hardcoded lib. The issue I was having was that I had another external repository use the protoc executable, however, since the libs did not exist in this location @loader_path/../lib, it was causing library load issues.