Index: ffi/build.py
--- ffi/build.py.orig
+++ ffi/build.py
@@ -182,7 +182,7 @@ def main_windows():
 
 
 def main_posix(library_ext):
-    generator = 'Unix Makefiles'
+    generator = 'Ninja'
     config = 'Release'
     if not os.path.exists(build_dir):
         os.mkdir(build_dir)
