The same error is triggered from within Tcl/Tk. LinuxCNC I do not think to be to blame.
$ wish % package require Img couldn't load file "/usr/lib/tcltk/x86_64-linux-gnu/Img1.4.13/libtifftcl4.1.0.so": /usr/lib/tcltk/x86_64-linux-gnu/Img1.4.13/libtifftcl4.1 .0.so: undefined symbol: _TIFFsetString, version LIBTIFF_4.0^
