[asterisk-dev] Problems with custom C-file: undefined reference

[Julian Fleischhauer]

Hey all,

I have a problem using a custom C-file. The error ouput received when 
compiling is given below.

error output
.../system.c:1330: undefined reference to `XML_ParserCreate'
...
.../system.c:1465: undefined reference to `sip_get_header'
...
.../system.c:1608: undefined reference to `pcap_lookupnet'
...


Before, I had all code in chan_sip.c. I want to transfer the code into a 
separate file (system.c) now. The dependencies given below MODULEINFO 
are customly set and worked fine when used in chan_sip.c. Can anyone 
figure out if something else has to be added somewhere? The code is 
quoted below:

sip.h
const char *sip_get_header(const struct sip_request *req, const char 
*name);

system.h
#include "asterisk/netsock2.h"

void ast_some_function(struct sip_pvt *p, struct ast_sockaddr *addr);

system.c
/*** MODULEINFO
  	<depend>sqlite3</depend>
  	<depend>expat</depend>
  	<depend>pcap</depend>
	<support_level>extended</support_level>
***/

#include "asterisk/system.h"
#include "asterisk/sip.h"

void ast_some_function(struct sip_pvt *p, struct ast_sockaddr *addr)
{
     xmlParser = XML_ParserCreate(NULL);
    ...
    ast_copy_string(touser, sip_get_header(req, "To"), 
strlen(sip_get_header(req,       "To"))+1);
    ...
    pcap_lookupnet(pcapDev, &netp, &maskp, errbuf);
}

chan_sip.c
#include "asterisk/system.h"
#include "asterisk/sip.h"

ast_some_function(p, addr);


Thank you for any help!

Regards,
Juliannn