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let users define PKGCONFIG_INSTALL_DIR
FreeBSD wants *.pc files in ${PREFIX}/libdata/pkgconfig,
${PREFIX}/lib/pkgconfig is not good eanough a configuration point.
let users override MAN_INSTALL_DIR
this makes the build more cooperative with FreeBSD ports:
FreeBSD wants man pages in ${PREFIX}/man, yet ${PREFIX}/share/man
exists in the staging area as well for some reason. i'm too lazy
to chase the cause, esp. as the copout means more freedom to users.