Index: tests/pybin/tools.py
===================================================================
--- tests/pybin/tools.py	(revision 767a8efb6cd2f46125b4b2bf0c84393ab2eddcfd)
+++ tests/pybin/tools.py	(revision 50a8aa9687fd9dacbd515bcc1dfa256445d85471)
@@ -46,5 +46,5 @@
 
 			print(cmd)
-			return 0, None
+			return 0, None, None
 
 		with contextlib.ExitStack() as onexit:
@@ -291,5 +291,5 @@
 ################################################################################
 def jobserver_version():
-	make_ret, out, err = sh('make', '.test_makeflags', '-j2', output_file=subprocess.PIPE, error=subprocess.PIPE)
+	make_ret, out, err = sh('make', '.test_makeflags', '-j2', ignore_dry_run = True, output_file=subprocess.PIPE, error=subprocess.PIPE)
 	if make_ret != 0:
 		print("ERROR: cannot find Makefile jobserver version", file=sys.stderr)