No. Sorry Deds, I must have misread your answer or something...
It's still not working.
After "make" I edited /usr/local/src/postgresql-7.1.3/src/pl/tcl/Makefile.tcldefs
and changed the line:
TCL_SHLIB_LD = gcc -pipe -shared -Wl,-soname,libtcl.so.0
to read:
TCL_SHLIB_LD = gcc -pipe -shared -Wl,-soname,libpltcl.so.0
...and continued as usual.
Do I have to add some symlink? Did you get it to work BTW?