Note that numpy is required to build PyIlmBase
@@ -18,6 +18,13 @@ named COPYING (included in this distribution) for details.
BUILDING ILMBASE
----------------
+PyIlmBase requires numpy to be available to the builder. Install with
+your favorite package manager or use a Python virtualenv:
+
+virtualenv numpy
+soure numpy/bin/activate
+pip install numpy
+
To build IlmBase on GNU/Linux or other UNIX-like systems, do this:
./configure
