Unpack the tarball into you chosen directory (possibly /usr/src/...).

Add the following to your /etc/make.conf file:

------------ cut ----------
# first hack at Ultimate++ ebuilds
PORTDIR_OVERLAY="${PORTDIR_OVERLAY} /full-path-to-upp-portage/"
GENTOO_MIRRORS="${GENTOO_MIRRORS} /full-path-to-upp-portage/distfiles"
---------------------------

From there you should be able to "emerge upp" as usual.

Also remember to run env-update

Notes:
  The current install directory is in /opt/upp so that it can be
  easily managed and kept separate from the more typical /usr
  directory tree.

