same for me, I just tested RecalBox for the first time on an rpi5 and I am very amazed! Thank you 🙂
The only thing missing for me is also mamemess-current/ mame_libretro. Indentically, I now also have the libretro core in /usr/lib/libretro/mame_libretro.so, but I cannot figure out how to select it. I looked at a few ES config files, but so far no luck. @barleyguy could you point us to the right config file(s)?