Embeded librairy curses in C with 4Gl program

I have this source sockets.c code : void socket_error() { WINDOW *werror; int car; initscr(); werror = newwin(10,15,5,20); scrollok(werror,TRUE); wtimeout(werror,350); keypad(werror,TRUE); car = ERR; while(car == ERR) { switch(car=wgetch(werror)) { case ERR: { wprintw(werror, "TOUCHE"); break; } default : { delwin(werror); endwin(); } } } } int socket_open(nb_arg) int nb_arg; { char HostName[80]; int PortNum; struct sockaddr_in sa; struct hostent *hp; int s; if (nb_arg != 2) fgl_fatal(__FILE__, __LINE__, -1318); else { popint(&PortNum); popvchar(HostName, sizeof(HostName)); if ( (hp = gethostbyname(HostName)) == NULL) socket_error(); . . . } retint(s); retint(errno); return(2); } My Main.4GL code : MAIN DEFINE no_socket INTEGER DEFINE no_error INTEGER CALL socket_open("I016",3000) RETURNING no_socket, no_error END MAIN I compil with the syntax : c4gl main.4gl sockets.c -o test.4ge -lsocket -lcurses I have the errors : ld: Symbol wrefresh in /usr/informix/lib/libnforms.a is multiply defined. First defined in /usr/lib/libcurses.a ld: Symbol _endwin in /usr/informix/lib/libnforms.a is multiply defined. First d efined in /usr/lib/libcurses.a ld: Symbol tputs in /usr/informix/lib/libnforms.a is multiply defined. First def ined in /usr/lib/libcurses.a ld: Symbol newwin in /usr/informix/lib/libnforms.a is multiply defined. First de fined in /usr/lib/libcurses.a If I compil with the syntax : c4gl main.4gl sockets.c -o test.4ge -lsocket No errors with 'ld' but a big core dump when I run test.4ge. How can I resolve it ? How may I display a window in C source ? Regards