if [[ -n "$BREWVER" ]] ; then
run_or_err "Compiling/installing Perl $BREWVER (without testing, may take up to 5 minutes)" \
- "perlbrew install --as $BREWVER --notest --verbose $BREWOPTS -j $NUMTHREADS $BREWVER"
+ "perlbrew install --as $BREWVER --notest --verbose $BREWOPTS -j 2 $BREWVER"
# can not do 'perlbrew uss' in the run_or_err subshell above
perlbrew use $BREWVER || \