Problem linking volk gnuradio-3.7.4

Hi all, I have gnuradio-3.7.3 working fine with boost-1.50 on ubuntu
12.04, and I’m using USRP B200 with uhd3.7, all built from source.
Now I’m moving to gnuradio-3.7.4, but I got the following error linking
wolk, at the moment I don’t understand this. The same happens trying to
link to boost-1.55.

Any help is highly appreciated, thanks !

Stefano