set(revision unknown)
if(GIT)
    execute_process(COMMAND "${GIT}" -C "${SOURCE}" describe --tags --always --dirty
            OUTPUT_VARIABLE described RESULT_VARIABLE failed OUTPUT_STRIP_TRAILING_WHITESPACE ERROR_QUIET)
    if(failed EQUAL 0 AND NOT described STREQUAL "")
        set(revision ${described})
    endif()
endif()
file(WRITE "${OUTPUT}.new" "#pragma once\n#define ANYPS5_RELINKER_REVISION \"${revision}\"\n")
execute_process(COMMAND ${CMAKE_COMMAND} -E copy_if_different "${OUTPUT}.new" "${OUTPUT}")
file(REMOVE "${OUTPUT}.new")