in this case it's an in-house monstrosity that's got a lot of various languages and build systems involved, and the moment you update a compiler or build system

in this case it's an in-house monstrosity that's got a lot of various languages and build systems involved, and the moment you update a compiler or build system, everything jumps into a new location for no good reasons. it was just an example though - same issue with .h not found during compilation, or using a different compiler from the system wide one.