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-rw-r--r--doc/source/user/building.rst6
1 files changed, 6 insertions, 0 deletions
diff --git a/doc/source/user/building.rst b/doc/source/user/building.rst
index d6ca622f9..6d5f8c1b3 100644
--- a/doc/source/user/building.rst
+++ b/doc/source/user/building.rst
@@ -45,6 +45,12 @@ Building NumPy requires the following software installed:
can be used, including optimized LAPACK libraries such as ATLAS, MKL or the
Accelerate/vecLib framework on OS X.
+4) Cython
+
+ To build development versions of Numpy, you'll need a recent version of
+ Cython. Released Numpy sources on PyPi include the C files generated from
+ Cython code, so for released versions having Cython installed isn't needed.
+
Basic Installation
------------------