-t seems to not release memory

[yeled@…]

if i pass -t to port, it hogs all my memory until it finally dies.

--->  Extracting libbonobo-2.16.0.tar.bz2
DEBUG: setting option extract.args to /opt/local/var/db/dports/distfiles/libbonobo/libbonobo-2.16.0.tar.bz2
DEBUG: Assembled command: 'cd "/opt/local/var/db/dports/build/_Users_yeled_Documents_macports_dports_gnome_libbonobo/work" && /opt/local/bin/bzip2 -dc /opt/local/var/db/dports/distfiles/libbonobo/libbonobo-2.16.0.tar.bz2 | /usr/bin/gnutar --no-same-owner -xf -'
tclsh(21340,0x1813600) malloc: *** vm_allocate(size=16384) failed (error code=3)tclsh(21340,0x1813600) malloc: *** error: can't allocate region
tclsh(21340,0x1813600) malloc: *** set a breakpoint in szone_error to debug
unable to alloc 516 bytes
zsh: 21340 exit 1     sudo port -tvd build

and then

--->  Attempting to fetch gnome-vfs-2.16.3.tar.bz2 from http://mirror.aarnet.edu.au/pub/GNOME/sources/gnome-vfs/2.16/
--->  Verifying checksum(s) for gnome-vfs
--->  Extracting gnome-vfs
tclsh(9626,0x1828c00) malloc: *** vm_allocate(size=16384) failed (error code=3)
tclsh(9626,0x1828c00) malloc: *** error: can't allocate region
tclsh(9626,0x1828c00) malloc: *** set a breakpoint in szone_error to debug
unable to alloc 516 bytes
zsh: 9626 abort      sudo port -t build
sudo port -t build  362.16s user 733.47s system 57% cpu 31:47.51 total
13:16 eris:dports/graphics/jBrout% sudo port build