- add a conditional loop around PATCH_DIST_ARGS so the PATCH_DEBUG option
works
- improve conditional loops by checking if they are set to YES instead of
just being defined and use the :U variable modifier
- ${ECHO} -> echo
- fix fuzz in patches created by adding distribution patches
Porters: please make sure you use bsd.port.mk 1.75 or later when
updating ports. That version of the makefile adds all sums. Previous
versions of the makefile will still work for people installing ports.