@busywait said in Missing shared library libstdc++.so.6 for redream from 64-bit installer:
/opt/retropie/emulators/redream/redream.elf
That's an error in the RetroPie's package - it installs the 32bit (armhf) version of redream. Since there is no 64bit ARM version, it should probably just say that the package is unavailable. We'll fix this.