gitk will not start on Mac: unknown color name "lime" : <p>I've installed git on a mac via <code>brew install git</code>. When I try to start gitk I get the following error:</p>

<pre><code>Error in startup script: unknown color name "lime"
    (processing "-fore" option)
    invoked from within
"$ctext tag conf m2 -fore [lindex $mergecolors 2]"
    (procedure "makewindow" line 347)
    invoked from within
"makewindow"
    (file "/usr/local/bin/gitk" line 12434)
</code></pre>

<p>It appears that my Mac doesn't have a color named <code>lime</code>. </p>

<p>Can I add a lime color to the environment, or is there a better fix? </p>

<p>The git version is 2.7.0, and the Mac is running Yosemite 10.10.5</p>
