the ppl-0.11 build fails in the testsuite on x86_64 (on lucid 10.04 and natty
11.04), see
https://bugs.launchpad.net/ubuntu/+source/ppl/+bug/697305
apparently the test did succeed for the ppl-0.11 upload to Debian experimental.
GNU MP: Cannot allocate memory (size=8)
/bin/bash: line 5: 16671 Aborted ${dir}$tst
FAIL: memory1