When trying to build wpa_gui (Qt4 version) from openembedded it fails
because Qt4 is compiled without session manager and thus wpa_gui fails
to compile.
I attached a patch, that enables compiling without Session Manager (via
preprocessor) if it is not compiled into Qt4; otherwise, it behaves as
it does right now.
I checked to build on my host (Debian unstable, Session Manager
enabled) and openembedded (Session Manager disabled).