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> I have sent you the files.

Thanks. I've been able to compile Lua 5.2.1 with float as numbers with the
changes below. It compiles with no warnings under 

i686-apple-darwin11-llvm-gcc-4.2 (GCC) 4.2.1 with -Wall -Wextra 

% diff luaconf.h,orig luaconf.h
386,387c386
< #define LUA_NUMBER_DOUBLE
< #define LUA_NUMBER	double
---
> #define LUA_NUMBER	float
402,403c401,402
< #define LUA_NUMBER_SCAN		"%lf"
< #define LUA_NUMBER_FMT		"%.14g"
---
> #define LUA_NUMBER_SCAN		"%f"
> #define LUA_NUMBER_FMT		"%.7g"
416c415
< #define lua_str2number(s,p)	strtod((s), (p))
---
> #define lua_str2number(s,p)	strtof((s), (p))
419c418
< #define lua_strx2number(s,p)	strtod((s), (p))
---
> #define lua_strx2number(s,p)	strtof((s), (p))
430,431c429,430
< #define luai_nummod(L,a,b)	((a) - floor((a)/(b))*(b))
< #define luai_numpow(L,a,b)	(pow(a,b))
---
> #define luai_nummod(L,a,b)	((a) - floorf((a)/(b))*(b))
> #define luai_numpow(L,a,b)	(powf(a,b))
446a446,449
> #if defined(lmathlib_c)
> #define l_tg(x)		x##f
> #endif
>