tk-itk4-dev - 4.2.5~20240521-1 main

[incr Tk] (or itk) combines the object-oriented power of [incr Tcl]
with the popular Tk graphical toolkit to create a framework for
creating mega-widgets. One such set of mega-widgets is provided by
the iwidgets package.
.
This package contains the headers and libraries needed to embed or
add C extensions to itk.