Snort output plugins query

[honey grp <honeypict () yahoo co in>]

Hi,
  i am trying to install snort with an output plugin
written separately. i made the specified changes in
plugbase.c.
when i say make,
i get the following errors,

output-plugins/libspo.a(spo_alert_bns.o): In function
`AlertShellInit':
/snort-1.9.0/src/output-plugins/spo_alert_bns.c:88:
undefined reference to `pthread_create'
output-plugins/libspo.a(spo_alert_bns.o): In function
`ShellCleanExitFunction':
/snort-1.9.0/src/output-plugins/spo_alert_bns.c:214:
undefined reference to `pthread_join'
output-plugins/libspo.a(spo_alert_bns.o): In function
`ShellRestartFunction':
/snort-1.9.0/src/output-plugins/spo_alert_bns.c:230:
undefined reference to `pthread_join'
collect2: ld returned 1 exit status
make[1]: *** [snort] Error 1
make[1]: Leaving directory `/snort-1.9.0/src'
make: *** [all-recursive] Error 1


Please guide , where am i making mistake?
Waiting for your reply,
Sweta

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