The latest version of the trusty python-graph-tool package depends on :

gcc-5-base (= 5.2.1-22ubuntu2) (caused by libgomp1);

libstdc++6 (>= 5).

However, these versions aren't backported to Ubuntu 14.04LTS (trusty). 

Is there a work around, or should I move to a non LTS Ubuntu version ? 

Thanks !

f