update installation instructions

ddale · ddale · commit c1df6bf322d4 · 2010-04-19T18:28:54.000Z
svn path=/trunk/matplotlib/; revision=8243
diff --git a/doc/users/installing.rst b/doc/users/installing.rst
@@ -126,7 +126,10 @@ These are external packages which you will need to install before
 installing matplotlib. Windows users only need the first two (python
 and numpy) since the others are built into the matplotlib windows
 installers available for download at the sourceforge site.  If you are
-building on OSX, see :ref:`build_osx`
+building on OSX, see :ref:`build_osx`. If you are installing
+dependencies with a package manager, you may need to install the
+development packages (look for a "-dev" postfix) in addition to the
+libraries themselves.
 
 :term:`python` 2.4 (or later but not python3)
     matplotlib requires python 2.4 or later (`download <http://www.python.org/download/>`__)
