Add Makefile comment on why bsd.port.pre.mk is needed.
Ah, okay. Based on experience: most times everything is fine. And sometimes, especially if you don't expect anything, an dependency or something else will fail. Better be safe than to get fallout and helpful emails ;)
Bump audio/pms-devel PORTREVISION for dependencies change.
Fix variables ordering.
Remove leftover USES=compiler and MAKE_ENV.