Question: I use *gitk* for keeping an eye onto branches, commits and so on ...
I am running Ubuntu 14.04. and noticed that the background color of the branch label is different in comparison to what I am used to on another machine running Ubuntu 13.10. Currently I have Git 1.9.3 installed.

![Branch in gitk](https://i.stack.imgur.com/h0XH2.png)

Is there a way to customize the background color of the branch label in *gitk*?

Answer: 
That appears to be the `headbgcolor`, which is not available from the GUI colour settings.

Close `gitk`, then modify `~/.config/git/gitk` and change

```
set headbgcolor green

```

to some other colour. Hex codes appear to be supported unquoted, e.g.

```
set headbgcolor #123456

```
For Windows, you need to change `headbgcolor` in your `%HOMEPATH%\.gitk`hidden file.