Fix imports

helpers/compile-build.py

 #!/usr/bin/python3
+import os
 import sys
 import argparse
 from helperslib import BuildSpecs, BuildSystem, CommonUtils, EnvironmentHandler

pipeline-templates/XenialQt5.7.template

@@ -73,7 +73,7 @@ node('LABEL HERE') {
 		// Finally we can build it! (Once again, through a helper)
 		stage('Compiling') {
 			// We use a helper here so we can determine the appropriate number of CPUs (-j) to build with
-			sh 'python ci-tooling/helpers/compile-build.py --project projectName --branchGroup branchGroup --platform XenialQt5.7 --installTo $WORKSPACE/install-prefix/'
+			sh 'python ci-tooling/helpers/compile-build.py --project projectName --branchGroup branchGroup --platform XenialQt5.7 --usingInstall $WORKSPACE/install-prefix/'
 		}
 
 		// Now ensure that it installs....