Sinclair ZX Spectrum is one of my most loved systems of my childhood.
To make it work, just create this action.config file right next to your other RetroArch emulators.
ROM=/home/cpi/games/ZXSpectrum ROM_SO=/home/cpi/apps/emulators/fuse_libretro.so EXT=tzx,tap,z80,rzx,scl,trd LAUNCHER=retroarch -L TITLE=ZX Spectrum Roms SO_URL=http://buildbot.libretro.com/nightly/linux/armv7-neon-hf/latest/fuse_libretro.so.zip
Then place your roms into the /home/cpi/games/ZXSpectrum folder.
Here is application icon:
Only thing I struggle with is input mapping. Games are running, but Retropad Joypad input for player 1 is not working.