Known Implementation Flaws in the FreeBSD Ports Collection
USE_DOS2UNIX knob could use some improvements. Don't work blindly on binary files (ports/92688).
Performance really stinks. Someone should get down to profile the beast.
Slave ports inherit PORTVERSION and PORTREVISION from the master port. It's easy to make a modification to slave port, add PORTREVISION=1 and have the port version go backward, because master port already defines PORTREVISION?=2. Possible workaround: check for this in portlint. PR 62657