Symbol main in ./libpgtcl.so is not defined

Hi every body
I finnally was able to compile postgres --with-tcl on AIX 4.3.2.
I needed to add -ltcl8.3 and -L/usr/local/lib in Makefile to get rid off all
those symbol not found in the linking phase of libpgtcl.so .
I was so happy ! I make install and give it a try:

# cd /usr/local/pgsql/lib
# tcl
tcl > load ./libpgtcl.so
Error: couldn't load file "./libpgtcl.so":    0509-023 Symbol main in
./libpgtcl.so is not defined.

Oups...
What is that?
Is someone encontered this error?

Thanks in advance
Jacques Talbot