What version of DFly are you using?
See o.p.: 1.6.0
Aha! Just above the "real command line" message is the real error: <snip> I can't get past boost-libs, so I can't confirm the compiler error. If you try the build again from the beginning is the error exactly in the same place every time?
To test I did "bmake clean" and "bmake install clean". The build ended at the same place as the first time.