OTOH I almost always use 3 or so tty's
(alt-f[number) to UPGRADE ports, unless one
is a dependency of another.
Just to illustrate,
/rasqal/, /boost-jam/, /tiff/, /squash/
and I could browse etc in a 5th tty.
(Though I usually
to see if available memory will enable the X
server to start easily (here, above 70 percent
as the output of the "freecolor" command usually
means no problem).
(And smaller ports I often use
"portmaster -d ..." in one of the tty's)