* Don't assume the script will be called from the ports directory
* Use buildenv to set environment variables
* Set LOCALBASE and X11BASE to dummy variables to prevent the ports tree
from picking up packages installed on the host system, and patch up
the generated index at the end
(2) (portbuild) Change no-output timeout from 1800 to 3600. Some ports
seem to actually take more than 30 minutes inside a command.
(3) (portbuild) Add -p flag to tar when extracting bindist.
(4) (makeindex) Remove the -j flag to make index, the argument was 1 anyway.
Tools/portbuild for details.
Note that this is still a major work in progress. I probably forgot
something but I need to go to sleep. At least it works here (most of
the time :).