INSTALLATION_DIRS, as well as all occurrences of ${PREFIX}/man with
${PREFIX}/${PKGMANDIR}.
Fixes PR 35265, although I did not use the patch provided therein.
sysgen reads DEC Qbus or UNIBUS device names from standard input,
assigns CSR addresses and interrupt vectors to the devices according
to the DEC standard algorithm for auto-configuration, and prints
the resulting list of allocations to standard output.
The program attempts to conform to the CONFIG command of the VMS
SYSGEN program, but has simplified output. Specifically, it does
not print information about VMS device naming and support.
