Dear CMake community, firstly, thank you for the extremely useful build tool, it's saved me a lot of time and effort!
I'm trying to solve the following problem: I'd like the user (i.e. non-developer compiling my code) to have the option to specify a location for an external library and *iff* this option is set it should be used as the 'top-priority' search location for that library, falling back to all the others if it is not found or not set. Ideally this option would be set as a variable so that it is visible in e.g. ccmake. The reason for doing this is that if the user just sets a variable to indicate the library path I would then have to manually check that the library does indeed exist at that path. Is there a way to do this? Many thanks, -Martin
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