wget -c http://downloads.sourceforge.net/project/p7zip/p7zip/9.38.1/p7zip_9.38.1_src_all.tar.bz2
tar -xjf p7zip_9.38.1_src_all.tar.bz2
cd p7zip_9.38.1
make DEST_HOME="/usr" # Doesn't mind -j#
make DEST_HOME="/usr" install