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Note the use of `+=` so that if the variable is already set in the default [.filename]#make.conf# its content will not be overwritten.
Pruning no Longer Needed Distfiles
Poudriere comes with a built-in mechanism to remove outdated distfiles that are no longer used by any port of a given tree. The command
# poudriere distclean -p portstree
will scan the distfiles folder, `DISTFILES_CACHE` in [.filename]#poudriere.conf#, versus the ports tree given by the `-p _portstree_` argument and prompt for removal of those distfiles. To skip the prompt and remove all unused files unconditionally, the `-y` argument can be added:
# poudriere distclean -p portstree -y