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-rw-r--r--README.rst1
1 files changed, 1 insertions, 0 deletions
diff --git a/README.rst b/README.rst
index 21bd63fd64..5ffcff22cd 100644
--- a/README.rst
+++ b/README.rst
@@ -120,6 +120,7 @@ Installing prerequisites on Mac OS X::
     xcode-select --install
     sudo easy_install pip
     sudo pip install virtualenv
+    brew install pkg-config libffi
 
 Installing prerequisites on Raspbian::