Mention about necessity to install Python headers in order to build sandbox site.
@@ -52,6 +52,11 @@ play around with Oscar.
don't support Windows and are tricky to be properly installed, and therefore
you might encounter some errors that prevent a successful installation.
+In order to compile uWSGI, which is a dependency of the sandbox, you will
+first need to install the Python development headers with:::
+
+ $ sudo apt-get install python3-dev
+
Install Oscar and its dependencies within a virtualenv:
.. code-block:: bash
