This command works to get the files and compile them:
git clone a-valid-git-url
for example:
git clone git://cfdem.git.sour
in my case, i had the same problem while i try any git -- commands (eg git status) using windows cmd. so what i do is after installing git for window https://windows.github.com/
in the environmental variables, add the class path of the git on the "PATH" varaiable. usually the git will installed on C:/user/"username"/appdata/local/git/bin
add this on the PATH in the environmental variable
and one more thing on the cmd go to your git repository or cd to where your clone are on your window usually they will be stored on the documents under github
cd Document/Github/yourproject
after that you can have any git commands