I tried to compile a socket programming code under SUN Solaris by using g++, i get the following errors:

Undefined first referenced
symbol in file
__xnet_connect /var/tmp//ccidZvCu.o
__xnet_socket /var/tmp//ccidZvCu.o
getaddrinfo /var/tmp//ccidZvCu.o
freeaddrinfo /var/tmp//ccidZvCu.o
gai_strerror /var/tmp//ccidZvCu.o
ld: fatal: Symbol referencing errors. No output written to a.out
collect2: ld returned 1 exit status

Note: the program compiles under Linux - Ubuntu.

Any help? Where can i find the library? How can i link it to my code?