lua 5.2 - "require" not work in embeded lua -

in code load , run test.lua file

int main (){     l = lual_newstate();     lual_openlibs(l);     lual_dofile(l, "test.lua");     lua_close(l);     return 0; } 

my test.lua file contents

print ("s1"); r=require 'simple'; print ("s2"); 

the simple module installed before

when run ./lua_c ; output only: s1

but when run lua test.lua; output

s1 s2 

and r in't nil

simple failing load or parse or execute. find problem, use lual_loadfile instead of lual_dofile , check return value. if non zero, there load error, can pop off lua stack , print. if no error, lua_pcall(l, 0, lua_multret, 0)) run chuck created loadfile, , again check return code error, pop off stack , print. somehting this:

int main () {     l = lual_newstate();     lual_openlibs(l);      if (lual_loadfile(l, "test.lua"))     {          cout << "error: " << lua_tostring(l, -1) << endl;     }     else if (lua_pcall(l, 0, lua_multret, 0))     {          cout << "error: " << lua_tostring(l, -1) << endl;     }     else     {          // call successful     }      lua_close(l);     return 0; } 

update: know error message simple.so has undefined symbol: lua_gettop, know there link error. perhaps simple.so isn't linked lua51.so, since works lua.exe, linked lua lib, 1 would work app, surely linked too. possibility lua.exe statically linked simple.so not linked. verify simple.so linked lua51.so , lib links can found such via ld_library_path. verify lua.exe linked same .so.