--- a/contrib/automation/linux-requirements.txt.in	Sat Nov 02 22:21:25 2019 +0000
+++ b/contrib/automation/linux-requirements.txt.in	Thu Oct 31 19:54:58 2019 -0700
@@ -1,3 +1,5 @@
+# black pulls in typed-ast, which doesn't install on PyPy.
+black ; python_version >= '3.6' and platform_python_implementation != 'PyPy'
 # Bazaar doesn't work with Python 3 nor PyPy.
 bzr ; python_version <= '2.7' and platform_python_implementation == 'CPython'
 docutils