C++ multiple undefined reference error MinGW -


i have add graphics.h , winbgim.h libraries, , libbgi.a mingw. can found here. archive has folders indicate directory should placed under /mingw. have added -lbgi -lgdi32 -lcomdlg32 -luuid -loleaut32 -lole32 link options, specified in following link: http://www.infobits.ro/medii-mingw-developer-studio3.php. (sorry, it's in romanian, images quite easy understand).
when try run following code: 

#include <graphics.h> #include <iostream>  using namespace std;  int main() {     int gdriver = detect, gmode;     initgraph(&gdriver, &gmode, "");     if (graphresult()) {         cout<<"tentativa nereusita ...";     }     else {         cout<<"everything working!";         setcolor(red);         moveto(0,0);         lineto(getmaxx(),getmaxy());     }     cout<<endl<<"press close";     getch();     return 0; }

i error log "undefined reference error". error log is:

c:\oji\mingwstudio\mingw\bin\..\lib\gcc-lib\mingw32\3.3.1\..\..\..\libbgi.a(winbgi.o)(.text+0xbd2):winbgi.cxx: undefined reference `std::string::_rep::_s_empty_rep_storage' c:\oji\mingwstudio\mingw\bin\..\lib\gcc-lib\mingw32\3.3.1\..\..\..\libbgi.a(winbgi.o)(.text+0x1b5e):winbgi.cxx: undefined reference `std::string::_rep::_s_empty_rep_storage' c:\oji\mingwstudio\mingw\bin\..\lib\gcc-lib\mingw32\3.3.1\..\..\..\libbgi.a(winbgi.o)(.text+0x1dcc):winbgi.cxx: undefined reference `__gnu_cxx::__exchange_and_add(int volatile*, int)' c:\oji\mingwstudio\mingw\bin\..\lib\gcc-lib\mingw32\3.3.1\..\..\..\libbgi.a(winthread.o)(.text+0x522):winthread.cxx: undefined reference `std::string::_rep::_s_empty_rep_storage' c:\oji\mingwstudio\mingw\bin\..\lib\gcc-lib\mingw32\3.3.1\..\..\..\libbgi.a(winthread.o)(.text+0x57e):winthread.cxx: undefined reference `__gnu_cxx::__exchange_and_add(int volatile*, int)'

any idea?


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