Binary package “tk-itk4-dev” in ubuntu oracular
[incr Tk] OOP extension version 4 for Tk - development files
[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.