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This is helpful on systems with multiple LLVM installations. For example, OpenBSD ships with LLVM in the base system, but without support for extra targets. A full LLVM version can be installed using the ports system, but even when it is, `cmake` is not going to pick it up unless `/usr/local` is explicitly added to the `cmake` search paths. Having the full `llvm-config` path printed on error is helpful to understand that the detected LLVM version was not the expected one.