Error while cloning git of open chemistry

I was the following this link Building Source Code — Avogadro 1.97.0 documentation to clone and build in my pc but was getting an error no directory found, can you please help me with this.
git clone --recursive git://
this command gives error : No such file or directory

Ah, I better go fixup those instructions. GitHub no longer supports the git:// protocol.

Try instead:

git clone --recursive