cache directories are hard-coded
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maybe replace with BSD_INSTALL* commands

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can man-db share whatis database?
if so maybe use same MAN_GROUP or user for the files.

need to test makewhatis, apropos and whatis

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can't remove some man/XX/ directories because also used by shadow
or other manpages
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makewhatis manpage needs paths in it fixed

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MESSAGE:
run makewhatis to install whatis database(s). Run when ever adding new man
pages