[LAD] prototype in header but declaration where?

[Renato]

Hi, very noob C question. I do this:

renato at acerarch /usr/include/alsa $ grep snd_seq_open *
seq.h:int snd_seq_open(snd_seq_t **handle, const char *name, int streams, int mode);
seq.h:int snd_seq_open_lconf(snd_seq_t **handle, const char *name, int streams, int mode, snd_config_t *lconf);

so I see that the function snd_seq_open has its prototype declared in seq.h... but 
where is the actual function definition?

cheers
renato