Build problems in building ATS on CentOS 5.2

[Gracy F]

Hi All,
 I am trying to build ATS 2.0.1 on my box. Its CentOS 5.2,  I ran configure,
but it did not create any Makefile.
At end it had configure thrown just a warinig "Can't find Tcl configuration
definitions".
What might be going wrong ?

Thanks,
GG