On my system I built luaffi, not luaffifb, because luaffi does not use luarocks. I had to manually apply some small patches from luaffifb to luaffi, as follows.

cd
sudo apt-get install lua5.3
sudo apt-get install lua5.3-dev
git clone https://github.com/jmckaskill/luaffi

Patch the makefile to use Lua 5.3 instead of Lua 5.2:

Change

LUA=lua

LUA_CFLAGS=`$(PKG_CONFIG) --cflags lua5.2 2>/dev/null || $(PKG_CONFIG) --cflags lua`
SOCFLAGS=-fPIC
SOCC=$(CC) -shared $(SOCFLAGS)
CFLAGS=-fPIC -g -Wall -Werror $(LUA_CFLAGS) -fvisibility=hidden -Wno-unused-function --std=gnu99

to 

LUA=lua5.3

LUA_CFLAGS=`$(PKG_CONFIG) --cflags lua5.3 2>/dev/null || $(PKG_CONFIG) --cflags lua`
SOCFLAGS=-fPIC
SOCC=$(CC) -shared $(SOCFLAGS)
CFLAGS=-fPIC -g -Wall -Werror $(LUA_CFLAGS) -fvisibility=hidden -Wno-unused-function --std=gnu99

Patch ffi.h:

Because in Lua 5.3 lua_remove is a macro not a function name, change

#if LUA_VERSION_NUM == 501
static void lua_callk(lua_State *L, int nargs, int nresults, int ctx, lua_CFunction k)
{
    lua_call(L, nargs, nresults);
}
/*
** set functions from list 'l' into table at top - 'nup'; each
** function gets the 'nup' elements at the top as upvalues.
** Returns with only the table at the stack.
*/
static void luaL_setfuncs (lua_State *L, const luaL_Reg *l, int nup) {
  luaL_checkstack(L, nup, "too many upvalues");
  for (; l && l->name; l++) {  /* fill the table with given functions */
    int i;
    for (i = 0; i < nup; i++)  /* copy upvalues to the top */
      lua_pushvalue(L, -nup);
    lua_pushcclosure(L, l->func, nup);  /* closure with those upvalues */
    lua_setfield(L, -(nup + 2), l->name);
  }
  lua_pop(L, nup);  /* remove upvalues */
}
#define lua_setuservalue lua_setfenv
#define lua_getuservalue lua_getfenv
#define lua_rawlen lua_objlen
static char* luaL_prepbuffsize(luaL_Buffer* B, size_t sz) {
    if (sz > LUAL_BUFFERSIZE) {
        luaL_error(B->L, "string too long");
    }
    return luaL_prepbuffer(B);
}
#endif

to

#if LUA_VERSION_NUM == 501
static void lua_callk(lua_State *L, int nargs, int nresults, int ctx, lua_CFunction k)
{
    lua_call(L, nargs, nresults);
}
/*
** set functions from list 'l' into table at top - 'nup'; each
** function gets the 'nup' elements at the top as upvalues.
** Returns with only the table at the stack.
*/
static void luaL_setfuncs (lua_State *L, const luaL_Reg *l, int nup) {
  luaL_checkstack(L, nup, "too many upvalues");
  for (; l && l->name; l++) {  /* fill the table with given functions */
    int i;
    for (i = 0; i < nup; i++)  /* copy upvalues to the top */
      lua_pushvalue(L, -nup);
    lua_pushcclosure(L, l->func, nup);  /* closure with those upvalues */
    lua_setfield(L, -(nup + 2), l->name);
  }
  lua_pop(L, nup);  /* remove upvalues */
}
#define lua_setuservalue lua_setfenv
#define lua_getuservalue lua_getfenv
#define lua_rawlen lua_objlen
static char* luaL_prepbuffsize(luaL_Buffer* B, size_t sz) {
    if (sz > LUAL_BUFFERSIZE) {
        luaL_error(B->L, "string too long");
    }
    return luaL_prepbuffer(B);
}
#elif LUA_VERSION_NUM == 503
static void (lua_remove)(lua_State *L, int idx) {
    lua_remove(L, idx);
}
#endif

Patch test.lua:

Add local cpath at top, for example:

package.cpath = package.cpath .. ';/home/mkg/luaffi/?.so'
print('package.cpath: ' .. package.cpath)

Because in Lua 5.3 ints are not floats any more, remove the assertion at about line 20:

    -- return _G.assert(a == b)

The test should now pass.



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