Fix devstack running behind a proxy
As suggested by dtroyer to resolve wheels not buildings
behind a proxy. Issue introduced in I0283b0dff9146b1b63bd821358505a93566270c6
Change-Id: Ib376469aff73a22ac2bc9d7d5a7f90081004aa8d
Closes-bug: 1426146
diff --git a/tools/build_wheels.sh b/tools/build_wheels.sh
index 31398f9..f1740df 100755
--- a/tools/build_wheels.sh
+++ b/tools/build_wheels.sh
@@ -57,7 +57,7 @@
virtualenv $TMP_VENV_PATH
# Install modern pip and wheel
-$TMP_VENV_PATH/bin/pip install -U pip wheel
+PIP_VIRTUAL_ENV=$TMP_VENV_PATH pip_install -U pip wheel
# VENV_PACKAGES is a list of packages we want to pre-install
VENV_PACKAGE_FILE=$FILES/venv-requirements.txt