c++ - SDL: Undefined symbols for architecture x86_64 -

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i'm working on simple wrapper sdl function sort of game engine. @ moment have simple temporary main function looks this:

#include <iostream>  int main(int argc, char * argv[]) {   std::cout << "still in development!\n";   return 0; }

along simple functions wrapper:

#include "sdl.h"  namespace snowshoe {   void initialize()   {     sdl_init(sdl_init_everything);   }    void release()   {     sdl_quit();   }    void update(sdl_surface * screen)   {     sdl_flip(screen);   } }

but when try compile 2 following error:

undefined symbols architecture x86_64:   "_sdl_flip", referenced from:       snowshoe::update(sdl_surface*)      in snowshoe-iru.o   "_sdl_init", referenced from:       snowshoe::initialize()              in snowshoe-iru.o   "_sdl_quit", referenced from:       snowshoe::release()                 in snowshoe-iru.o ld: symbol(s) not found architecture x86_64 collect2: ld returned 1 exit status

before asks, i've included flags need:

`sdl-config --cflags` -lsdl

any ideas? i'm running osx mountain lion , compiling command line (not xcode).

try `sdl-config --cflags --libs`

on system gives

-i/usr/include/sdl -d_gnu_source=1 -d_reentrant -l/usr/lib/x86_64-linux-gnu -lsdl

for example, do

g++ fractal.cpp -o3 -fopenmp -mavx `sdl-config --cflags --libs` -o fractal_gcc_avx


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