Index: lit/lit.cfg
===================================================================
--- lit/lit.cfg
+++ lit/lit.cfg
@@ -54,7 +54,7 @@
 config.environment['PYTHON_EXECUTABLE'] = getattr(config, 'python_executable', '')
 
 # Register substitutions
-config.substitutions.append(('%python', config.python_executable))
+config.substitutions.append(('%python', "'%s'" % (config.python_executable)))
 
 debugserver = lit.util.which('debugserver', lldb_tools_dir)
 lldb = "%s -S %s/lit-lldb-init" % (lit.util.which('lldb', lldb_tools_dir),