Index: tests/pybin/tools.py
===================================================================
--- tests/pybin/tools.py	(revision 4e83bb73307a616bea9e819e1d7680a4fff893e1)
+++ tests/pybin/tools.py	(revision a6cfb4db6b2bd0dcc1cc1a1c8137039ce7f0e148)
@@ -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)