# expect variables IN and OUT
EXECUTE_PROCESS(COMMAND mandoc -T man ${IN} OUTPUT_VARIABLE MAN)
STRING(REGEX REPLACE "(NetBSD|macOS) [0-9.]*" "NiH" MAN "${MAN}")
FILE(WRITE ${OUT}.new "${MAN}")
CONFIGURE_FILE(${OUT}.new ${OUT} COPYONLY)
FILE(REMOVE ${OUT}.new)