ports/misc/airoflash fetches the airoflash.c file every time you do
a "make checksum". I fear the mastersite will not be happy about this :-).
How-To-Repeat: Do the "make checksum" with the files in /usr/ports/distfiles :-).
or call the "make checksum" twice in the directory.
Over to maintainer
I checked in a fix to avoiding fetching if the file is in distfiles.