Error on using git mergetool with opendiff after Mavericks and Xcode 5.0.1

Question

I just install OS X Maverics and Xcode 5.0.1 but now when I'm trying to use git mergetool with opendiff I'm getting this error:

Normal merge conflict for 'Assets/Scripts/Characters/MobAI.cs':
{local}: modified file
{remote}: modified file
Hit return to start merge resolution tool (opendiff): 
2013-11-01 11:51:11.980 opendiff[1706:1007] too few arguments
2013-11-01 11:51:11.985 opendiff[1706:1007] usage: opendiff file1 file2 [-ancestor ancestorFile] [-merge mergeFile]

The xcode-select path is /Applications/Xcode.app/Contents/Developer/

Any idea?

Answer 1

This was my situation:

git config -l

(abbreviated output)

merge.tool=opendiff
mergetool.opendiff.cmd=/usr/bin/opendiff $2 $5 -merge $1

How I fixed it:

git config --global --unset mergetool.opendiff.cmd