Just add this line of code at the first line of your code:
setmetatable(_G, { __index = rl })
WARNING: Their bindings uses headers by default and not LuaJIT!
raylua is 100% compatible with these bindings,You just might need to remove the library linking and all done
DEVELOPER NOTES: Alexander Matz's FFI bindings missing a lot of compatibility with TSnake41's bindings,So if you use Alexander Matz's bindings use my bindings instead cause it supports %100 of it's code.