keep-life avoids removing the life stuff.
keep-cri avoids removing the cray research inc changes to emacs.
keep-chill avoids removing CHILL support.
-keep-mpw avoids removing MPW host support.
keep-gm avoids removing GM-specific stuff.
+lose-gdbtk removes gdbtk stuff. This is really only needed for
+ FSF GDB releases.
+
for-intel builds a distribution in the style that Intel likes.
for-fsf builds a distribution in the style that the FSF likes.