llvm dev - Mar 2018 - check_include_file not respecting CMAKE_PREFIX_PATH

$ file /home/andy/misc/bootstrap/out/native/include/zlib.h
/home/andy/misc/bootstrap/out/native/include/zlib.h: C source, ASCII text


$ cmake /home/andy/misc/bootstrap/llvm-6.0.0.src
-DCMAKE_PREFIX_PATH=/home/andy/misc/bootstrap/out/native
-DCMAKE_INSTALL_PREFIX=/home/andy/misc/bootstrap/out/native
-DCMAKE_BUILD_TYPE=Release
-DLLVM_EXPERIMENTAL_TARGETS_TO_BUILD=WebAssembly; \


-- Looking for zlib.h - not found



I propose to use find_path and find_library instead of check_include_file.
Shall I submit a patch?
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