From 5c3984b7fdf237219eb54f095de3cb563da9b4f7 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Tina=20M=C3=BCller?= <cpan2@tinita.de>
Date: Thu, 28 Jun 2018 21:23:52 +0200
Subject: [PATCH] Force cython when building sdist

Fixes #182
---
 setup.py | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/setup.py b/setup.py
index a1a87a2f..949098c1 100644
--- a/setup.py
+++ b/setup.py
@@ -77,12 +77,18 @@
     sys.modules['distutils.command.build_ext'].Extension = _Extension
 
 with_cython = False
+if 'sdist' in sys.argv:
+    # we need cython here
+    with_cython = True
 try:
     from Cython.Distutils.extension import Extension as _Extension
     from Cython.Distutils import build_ext as _build_ext
     with_cython = True
 except ImportError:
-    pass
+    if with_cython:
+        raise
+    else:
+        pass
 
 try:
     from wheel.bdist_wheel import bdist_wheel