[graph-tool] Installing in a virtual environment

Hi all, I've tried to install graph-tool inside a virtual environment in multiple ways now, e.g. 1. pip install graph-tool 2. pip install http://downloads.skewed.de/graph-tool/graph-tool-2.2.15.tar.bz2 3. easy_install graph-tool 4. Running "configure-make-make install" from source The first three failed basically because there's no setup.py and the fourth one failed because it couldn't find numpy (which is already installed in the virtual environment). I could do a system-wide installation, but that's not what I want. Have you guys successfully installed graph-tool inside a virtual environment? Best, --  Hector