LinuxQuestions.org - gcc 3.4.1 and c implicit declaration

- Programming (https://www.linuxquestions.org/questions/programming-9/)

- - gcc 3.4.1 and c implicit declaration (https://www.linuxquestions.org/questions/programming-9/gcc-3-4-1-and-c-implicit-declaration-283022/)

gcc 3.4.1 and c implicit declaration

this must be simple but i can't figure it out

main has
#include <jack/jack.h>
then later

Code:

 while ((opt = getopt_long (argc, argv, options, long_options, NULL)) != -1)

    {

      switch (opt)

      {

      case 'h':

        print_help ();

        exit (0);

        break;

      case 'D':

        jack_set_server_dir (optarg);

        break;

jack/jack.h has
void jack_set_server_dir (const char *path);

the object compiles with the warning
main.c:112: warning: implicit declaration of function `jack_set_server_dir'

the the link fails with
ladccad-main.o(.text+0x20d): In function `main':
: undefined reference to `jack_set_server_dir'
collect2: ld returned 1 exit status
make[2]: *** [ladccad] Error 1

how do i fix ?

Not familiar with those functions, but I'd check to see if the declaration of jack_set_server_dir is within any sort of #ifdefs in jack/jack.h...

Also, when you are compiling do you link the appropriate libraries?