Install 'Expect'

So far I have custom compiled my own PHP5. I also installed TCL in my home directory - /home/username/tcl/

The next program i’m trying to install is ‘expect’ which required TCL. But when I do:

./configure --prefix=/home/username/expect

and it goes thru the configuration process, it can’t find the location for tcl… what extra code/command do I need to install this program ‘expect’