To build ports from a committer account on freefall and realted machnines.
You can add this to your .profile on freefall.

1. Only your user directory is writeable.
2. It is shared between different archs.

So we need a tree we can install into:
PREFIX will be /home/<user>/local-<arch>

export UNAMEM=`uname -m`
export LOCALBASE=${HOME}/local-${UNAMEM}
export X11BASE=${HOME}/local-${UNAMEM}
export PKG_DBDIR=${HOME}/local-${UNAMEM}/var.db.pk
export PACKAGES=${HOME}/local-${UNAMEM}/packages
export __MAKE_CONF=${HOME}/local-${UNAMEM}/etc/make.conf
export PORT_DBDIR=${HOME}/local-${UNAMEM}/options

Extend path so we can run dependend programs

export PATH=${HOME}/batch:${HOME}/local-${UNAMEM}/bin:${HOME}/local-${UNAMEM}/sbin:${PATH}
export LD_LIBRARY_PATH=${HOME}/local-${UNAMEM}/lib
export LD_RUN_PATH=${HOME}/local-${UNAMEM}/lib

tell Makefile who owns it all

export INSTALL_AS_USER=yes
export WHOAMI=`whoami`
export BINOWN=${WHOAMI}
export BINGRP=${WHOAMI}
export MANOWN=${WHOAMI}
export MANGRP=${WHOAMI}

ranlib on readonly libs dont work

export SHAREMODE=644

Ldconfig must write, so we change the options

export LDCONFIG="/sbin/ldconfig -i -f ${HOME}/local-${UNAMEM}/etc/ldconfig.hints"

The place for cached distfiles shared, with all archs

export DISTDIR=${HOME}/distfiles

decide where temp build stuff

export WRKDIRPREFIX=${HOME}/work

Finally we may use our own ports tree

export PORTSDIR=${HOME}/ports