On Thu, 2017-03-30 at 15:54 -0400, Peter van der Does wrote: > It looks like the git gui needs TCL/TK 8.6.0 or higher. Since that > version the command 'ttk::style theme use' has been changed, which > allows the command to be run without an argument and then returning the > current theme used. > I believe RHEL6 use Tk-8.5.7 but I can't be 100% sure. It does. $ rpm -q tk tk-8.5.7-5.el6.x86_64 D.