There is no tracking information for the current branch.
Please specify which branch you want to merge with.
See git-pull(1) for details.
git pull <remote> <branch>
If you wish to set tracking information for this branch you can do so with:
git branch --set-upstream-to=origin/<branch> develop
git branch --set-upstream-to=origin/<branch> develop
原文：http://www.cnblogs.com/lhwblog/p/7243680.html