RECIPE FORMAT:
{CORENAME} {COREDIR} {URL} {BRANCH} {ENABLED} {COMMAND} {MAKEFILE} {SUBDIR} {ARGS}
or
{CORENAME} {COREDIR} {URL} {BRANCH} {ENABLED} {COMMAND} {MAKEFILE} {SUBDIR} {ARGS} | core1:arg=1 core2:arg=2 core3:arg3

Ex:
2048 libretro-2048 https://github.com/libretro/libretro-2048.git master YES GENERIC Makefile.libretro .
bsnes libretro-bsnes https://github.com/libretro/bsnes-libretro.git libretro YES GENERIC Makefile . | bsnes_accuracy:profile=accuracy bsnes_balanced:profile=balanced bsnes_performance:profile=performance

Command should usually be GENERIC and REPOTYPE should usually be project.
Notable exceptions are PPSSPP and PICODRIVE. Those are submodule repos.

When adding multiple recipes for the same repo make sure they use different
directories.