diff --git a/debian/settings.py b/debian/settings.py
index 57ae45f..9bcac6b 100644
--- a/debian/settings.py
+++ b/debian/settings.py
@@ -167,4 +167,6 @@ LOGGING = {
 
 INSTALLED_APPS += ('wcsinst.wcsinstd',)
 
-WCSINST_WCSCTL_SCRIPT = os.environ.get('WCSINST_WCSCTL_SCRIPT', 'wcsctl')
+for var in ('WCSINST_WCSCTL_SCRIPT', 'WCSINST_URL_TEMPLATE', 'WCS_APP_DIR'):
+    if var in os.environ:
+        globals()[var] = os.environ[var]