I have installed the tcl-tk recipe from homebrew on macOS Sierra.
The brew recipe is here: https://github.com/Homebrew/homebrew-core/blob/master/Formula/tcl-tk.rb
I have setup my environment to point to this.
I have installed tklib separately.
I can run all the widget demos no issue.
I can "package require ctext" and no issues.
-> tclsh
% info patchlevel
8.6.6
% package require Tk
8.6.6
% package require ctext
3.3
% exit
When I try and start tkcon...I get:
-> tkcon
Abort trap: 6
This doesn't happen if I have installed Tcl/Tk via ActiveTcl.
This is due to Ruby/Tk core issues, not tkcon.