diff --git a/lib/database b/lib/database
index b114e9e..ff1fafe 100644
--- a/lib/database
+++ b/lib/database
@@ -109,6 +109,11 @@
     install_database_$DATABASE_TYPE
 }
 
+# Install the database Python packages
+function install_database_python {
+    install_database_python_$DATABASE_TYPE
+}
+
 # Configure and start the database
 function configure_database {
     configure_database_$DATABASE_TYPE
diff --git a/lib/databases/mysql b/lib/databases/mysql
index 70073c4..d548db1 100644
--- a/lib/databases/mysql
+++ b/lib/databases/mysql
@@ -151,9 +151,12 @@
     else
         exit_distro_not_supported "mysql installation"
     fi
+}
 
+function install_database_python_mysql {
     # Install Python client module
     pip_install MySQL-python
+    ADDITIONAL_VENV_PACKAGES+=",MySQL-python"
 }
 
 function database_connection_url_mysql {
diff --git a/lib/databases/postgresql b/lib/databases/postgresql
index e891a08..a6bcf8c 100644
--- a/lib/databases/postgresql
+++ b/lib/databases/postgresql
@@ -100,9 +100,12 @@
     else
         exit_distro_not_supported "postgresql installation"
     fi
+}
 
+function install_database_python_postgresql {
     # Install Python client module
     pip_install psycopg2
+    ADDITIONAL_VENV_PACKAGES+=",psycopg2"
 }
 
 function database_connection_url_postgresql {
diff --git a/lib/stack b/lib/stack
index 9a509d8..11dd87c 100644
--- a/lib/stack
+++ b/lib/stack
@@ -16,13 +16,17 @@
 function stack_install_service {
     local service=$1
     if type install_${service} >/dev/null 2>&1; then
-        if [[ -n ${PROJECT_VENV[$service]:-} ]]; then
+        if [[ ${USE_VENV} = True && -n ${PROJECT_VENV[$service]:-} ]]; then
             rm -rf ${PROJECT_VENV[$service]}
-            source $TOP_DIR/tools/build_venv.sh ${PROJECT_VENV[$service]}
+            source $TOP_DIR/tools/build_venv.sh ${PROJECT_VENV[$service]} ${ADDITIONAL_VENV_PACKAGES//,/ }
             export PIP_VIRTUAL_ENV=${PROJECT_VENV[$service]:-}
+
+            # Install other OpenStack prereqs that might come from source repos
+            install_oslo
+            install_keystonemiddleware
         fi
         install_${service}
-        if [[ -n ${PROJECT_VENV[$service]:-} ]]; then
+        if [[ ${USE_VENV} = True && -n ${PROJECT_VENV[$service]:-} ]]; then
             unset PIP_VIRTUAL_ENV
         fi
     fi