@pop1234,

Although I appreciate your efforts, the basic problem remains the same: one needs a compiler with c++17 features to compile libsigc++-3.0 and for SH4, we have not got one. Please read on on the two github sites to read that c++17 is needed. Also note that the links to openvisione2 pertain to beta versions; the actually used ones still use libsigc++-2.0, and I am very curious how they get the beta compiled.

'Regards,
Audioniek.