I've gotten tired of rebuilding parrot only to find out, once again, that I've broken it with local changes. Thus, my 'reparrot' script:
if svn status | grep -E "^(M|C)"
echo Local changes found. Aborting.
perl Configure.pl && make test;
cd languages/perl6/ && make perl6 && make spectest
This should save me a lot of grief.