It is not possible to search by OS in ansible-galaxy (yet?)

My twits to the Ansible creator:

@vicendominguez if you look at any role page you will see the OS support list.
— Michael DeHaan (@laserllama) May 26, 2014

@vicendominguez no, there isn't yet. Search for the role purpose first and then open the highest rated ones. Also easy to modify.
— Michael DeHaan (@laserllama) May 26, 2014

So... if you find a interesing role may be you cannot use it. You need to verify role by role if it is correct for your OS or not..... there is not another way. :(