[CentOS] Cannot find Tcl library(Sort of OT)

Hey All,

I'm trying to build Tux Racer.  I get:

checking for tcl8.5 library... no
checking for tcl83 library... no
checking for tcl8.2 library... no
checking for tcl82 library... no
checking for tcl8.0 library... no
checking for tcl80 library... no
checking for tcl library... no
configure: error: Cannot find Tcl library

The install manual says I may have to pass some options to configure:

Many people will be able to run configure without passing any options. 
The more commonly-used configure options are:

     --with-tcl-libs=DIR: Specify Tcl library location
     --with-tcl-inc=DIR: Specify Tcl header file location
     --with-tcl-lib-name=NAME: Specify Tcl library base name

I have:

[mlapier at mushroom ~]$ rpm -qa | grep -i tcl
tclx-devel-8.4.0-15.el6.i686
tclx-8.4.0-15.el6.i686
tcl-brlapi-0.5.4-6.el6.i686
tcl-8.5.7-6.el6.i686
tcl-devel-8.5.7-6.el6.i686
tcl-pgtcl-1.6.2-3.el6.i686
[mlapier at mushroom ~]$

The problem I seem to have is that I don't know what to use to replace 
DIR: or NAME: to make it happy.  Anyone know how to find the Tcl library 
location, Tcl header file location, and Tcl library base name?

CentOS release 6.3 (Final)
Linux mushroom.patch 2.6.32-279.19.1.el6.i686 #1 SMP Wed Dec 19 04:30:58 
UTC 2012 i686 i686 i386 GNU/Linux

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