Q: I run scons install and I get:

xdg-icon-resource install --size 64 --context apps
support/xdg/hi64-apps-ffado.png
scons: *** DirNodeInfo instance has no attribute 'csig'
scons: building terminated because of errors.

A: This is due to a bug in scons. Try downgrading scons to 0.97 or maybe upgrading scons to the most recent version. However this is not really a problem, since everything should have been installed properly.