--- a/setup.py	Mon Mar 23 14:38:00 2020 -0700
+++ b/setup.py	Wed Mar 25 18:25:58 2020 -0700
@@ -274,7 +274,7 @@
         if err or returncode != 0:
             printf("stderr from '%s':" % (' '.join(cmd)), file=sys.stderr)
             printf(err, file=sys.stderr)
-            return ''
+            return b''
         return out