I'm working with a development version of numpy version 1.10.0.dev0-30d755d.

When trying to install matplotlib I get an error saying
error: numpy 1.10.0.dev0-30d755d is installed but numpy>=1.6 is required by set(['matplotlib'])

This is because 1.10 is registering as less than 1.6.

I'm not sure if this is fixed in the head repository, but this causes an issue when using current release on pip. Should be an easy fix. I just wanted to ensure people were aware of it.