On our:
   SunOS operator 5.8 Generic_108528-13 sun4u sparc SUNW,Ultra-5_10

I get:

% make
gcc -g -O -o elog elog.c 
Undefined                       first referenced
 symbol                             in file
socket                              /var/tmp/ccgK4x1V.o
recv                                /var/tmp/ccgK4x1V.o
gethostbyname                       /var/tmp/ccgK4x1V.o
send                                /var/tmp/ccgK4x1V.o
gethostbyaddr                       /var/tmp/ccgK4x1V.o
connect                             /var/tmp/ccgK4x1V.o
ld: fatal: Symbol referencing errors. No output written to elog
collect2: ld returned 1 exit status
make: *** [elog] Error 1


I have no idea what is going on here