- Explicitly USE_GMAKE.
- Add a switch WITH_UCDSNMP to only depend on p5-SNMP if net-snmp4 is
preferred over net-snmp, as net-snmp provides SNMP.pm (unless compiled
WITHOUT_PERL).
- Add some files to pkg-plist as makefile install targets are lazy (i.e.
they use wildcards) to avoid package deinstall failures.
- Add some needed FreeBSD patches.
Submitted by: Hiroki Sato (patches)