compiling linux application

[mess-mate]

Hi,
can't compile a little linux application;
doesn't find the #include <linux/isdn.h> and all 
about that linux include :(
Is there anything I didn't install ?
Thanks for the help.
This is a part of the imonc.c file :
#include <errno.h>
#include <stdio.h>

#ifdef FLI4L					/* imonc on fli4-router	    */

#include <sys/types.h>
#include <sys/termio.h>

#else

#  ifdef linux
#    include <ncurses.h>
#  else
#    include <curses.h>
#  endif

#endif /* not FLI4L */

#include <string.h>
#include <ctype.h>
#include <time.h>
#include <sys/time.h>
#include <sys/types.h>
#include <unistd.h>
#include <stdlib.h>
#include <signal.h>

#include <netdb.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <arpa/inet.h>		/* decl of inet_addr()	    */
#include <sys/socket.h>

#include <linux/isdn.h>

mess-mate