whilst attempting to compile xfmail, i got this. i have xforms installed 
and all, and this is what ahppens...:
pork% make
(cd ../compface; make)
gcc  -O2  -c arith.c
gcc  -O2  -c file.c
gcc  -O2  -c compress.c
gcc  -O2  -c gen.c
gcc  -O2  -c face.c
ar rc libface.a arith.o file.o compress.o gen.o face.o
ranlib libface.a
gcc -o xfmail  -lforms -L/usr/X11R6/lib -lX11 -lXt -lXext -lXpm -lm -lICE 
-lSM -L../compface -lface 
/usr/lib/crt0.o: Undefined symbol `_main' referenced from text segment
*** Error code 1

Stop.
pork% 

ive edited the paths in the Makefile to suit my system...but i cant 
figure this out. Any help is much appreciated
-xiamin