报错信息如下：
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)
修复方案如下：
cd /usr/local/bin
sudo cp gitk gitkbak
sudo vi gitk
进入gitk后，把lime全部替换成green
:%s/lime/green/g
:wq!
返还项目目录，执行gitk