virtualenv --setuptools "$VENVDIR" || fatal "virtualenv $VENVDIR failed"
. "$VENVDIR/bin/activate"
+# Needed for run_test_server.py which is used by certain (non-Python) tests.
+pip install PyYAML
+
checkexit() {
if [[ "$?" != "0" ]]; then
title "!!!!!! $1 FAILED !!!!!!"