The macro "LUA_COMPAT2_5", that controls whether Lua should be
compatible with older versions, was 'misspelled' in opcode.c(1464):
This error makes the function "lua_setfallback", from Lua 2.5, absent
from the final library. This silly mistake can be corrected by patching
or by defining COMPAT2_5 in the makefile ("-DCOMPAT2_5").