diff --git a/images.sh b/images.sh
index 1997d91..8c9b68c 100755
--- a/images.sh
+++ b/images.sh
@@ -1,6 +1,6 @@
 #!/bin/bash -ex
 
-RELEASES="trusty xenial bionic" # disco"
+RELEASES="trusty xenial bionic disco"
 
 for release in $RELEASES ; do
     docker build -t extbuilder-${release} -f Dockerfile.${release} .
diff --git a/src/Makefile b/src/Makefile
index f2bb616..eb38b3d 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -1,7 +1,8 @@
 #!/usr/bin/make -f
 
 PY3_SRC=./cpython/
-PY3_CONFFLAGS=--prefix=$(DESTDIR)/opt/extpython/_OPT_DIR_ --with-ensurepip=install --enable-optimizations
+PY3_CONFFLAGS=--prefix=$(DESTDIR)/opt/extpython/_OPT_DIR_ --with-ensurepip=install
+# --enable-optimizations
 
 all:
 	cd $(PY3_SRC) && \
diff --git a/src/xenial-3.7.3.sh b/src/xenial-3.7.3.sh
new file mode 100644
index 0000000..0bb37b9
--- /dev/null
+++ b/src/xenial-3.7.3.sh
@@ -0,0 +1,13 @@
+#!/bin/bash -eux
+
+# Which dist to build on
+export EXTPYTHON_DIST=xenial
+# Release is used to select which tarball to download
+export PYTHON_RELEASE=3.7.3
+# Major version no is used in paths and labels (extpython-python${}, /opt/extpython/${}/...)
+export PYTHON_MAJOR=3.7
+# Tarball download URL
+export PYTHON_TARBALL="http://artifact.scc.net.davepedu.com/repo/tar/cpython/cpython/cpython-${PYTHON_RELEASE}.tar.gz"
+# Deps needed to build this package
+export CPYTHON_DEPS="libssl-dev zlib1g-dev libncurses5-dev libncursesw5-dev \
+    libreadline-dev libsqlite3-dev libgdbm-dev libdb5.3-dev libbz2-dev libexpat1-dev liblzma-dev tk-dev libffi-dev"