bluegriffin does not need gcc > 4.6.x to run. the bluegriffin binaries that are available from bluegriffin.org were built with a gcc that is newer than the one that ships with VL7, so to use those binaries we either have to upgrade our gcc or package a newer libstdc++.so.6 with bluegriffin.
Otherwise we would have to build griffin from source, which is what we should probably be doing anyway.
I try bluegriffon-1.4.1 on gcc-4.7.0 and it work. libstdc.so.6 is part of gcc-g++ package...
Bluegriffon did not provide the source code so I cannot build from source.