Patrick> This is needed for recent TEA support.
Patrick> Autoconf macro CY_AC_TCL_PRIVATE_HEADERS checks more file locations and
Patrick> determines TCL_PLATFORM according to the private header files found.
Patrick> A C macro TCL_PLATFORM_DEFINE is computed accordingly and defined from
Patrick> command line.

Patrick> The same applies to Tk.

Patrick> As in-tree Tcl/Tk sources have been removed, this case is left out.

Patrick> This change primarily targets Insight.

Seeing as Insight is the only user of any of this,

Yes, I think so too.

I wonder if we can update configure.ac & Makefile.def to remove in-tree Tcl/Tk/Itcl/Itk/Iwidgets handling, as they are no more present and not supported by Insight since 2015. I have a patch for it: https://sourceware.org/git/?p=insight.git;a=blob;f=patches/binutils-gdb/001-itcltk4.patch;h=ce2ada59b48a08d251a6de9d713afd88390a7a05;hb=HEAD

I think it's fine and
up to you.
Approved-By: Tom Tromey <tom@tromey.com>

Thanks for approval, Tom. Will commit soon.

Patrick