Hello.
Installing graph tool is quite harsh (at least for me) due to the large dependency on previously installed libs. MacPorts seems useful since it finds and install automatically all dependencies of any lib you`re trying to install.
These benefits notwithstanding, I'm having some troubles while concluding my installation. After installing all required libs using MacPorts, I can't configure graph tool (by ./configure).

Using ./configure purely, I get this:

checking consistency of all components of python development environment... no
configure: error: in `/Users/JaquelinyLima/Documents/graphtool':
configure: error: 
  Could not link test program to Python. Maybe the main Python library has been
  installed in some non-standard library path. If so, pass it to configure,
  via the LDFLAGS environment variable.
  Example: ./configure LDFLAGS="-L/usr/non-standard-path/python/lib"
  ============================================================================
   ERROR!
   You probably have to install the development version of the Python package
   for your distribution.  The exact name of this package varies among them.



Using ./configure PYTHON=/Apps/MacPorts/Python2.7 (macports location):

================
Detecting python
================
checking whether /Apps/MacPorts/Python2.7 version is >= 2.6... no
configure: error: Python interpreter is too old