[Nagiosplug-help] problem with new plugin check_pop3.c

[carole verdon]

I want to use the new plugin check_pop3.c submitted by Seamus Dean.

So, i copied check_pop3.c in /nagios-plugins-1.4.0alpha1/plugins and 
execute 'make' to compile it, but i have this error:
$ make check_pop3
gcc -g -O2  -L. -L/usr/local/ssl//lib  check_pop3.c   -o check_pop3
Undefined                       first referenced
 symbol                             in file
socket                              /var/tmp//ccEuubjD.o
gethostbyname                       /var/tmp//ccEuubjD.o
gethostbyaddr                       /var/tmp//ccEuubjD.o
connect                             /var/tmp//ccEuubjD.o
ld: fatal: Symbol referencing errors. No output written to check_pop3
collect2: ld returned 1 exit status
make: *** [check_pop3] Error 1

Can someone help me, please?

Carole.