Merge heads.

1 files changed, 3 insertions, 1 deletions

diff --git a/setup.py b/setup.py
index 5d4f44465a..6f6da7156c 100644
--- a/setup.py
+++ b/setup.py
@@ -252,7 +252,9 @@ class PyBuildExt(build_ext):
 
         build_ext.build_extensions(self)
 
-        longest = max([len(e.name) for e in self.extensions])
+        longest = 0
+        if self.extensions:
+            longest = max([len(e.name) for e in self.extensions])
         if self.failed:
             longest = max(longest, max([len(name) for name in self.failed]))