$ sudo apt-get update
$ sudo apt-get install itcl3-dev 

itcl3-dev is installed in your system.

Make ensure the itcl3-dev package were installed using the commands given below,

$ sudo dpkg-query -l | grep itcl3-dev *

You will get with itcl3-dev package name, version, architecture and description in a table

itcl3-dev package basic information: