I have installed Synocommunity untested package, and it still lacks a symlink.
Also don't forget that if you wish to have automatic login with SSL you will also need to adjust sshd_config. Something that's left out from the Synocom package too.
Take a look at this tutorial
for more details.
Note: you can skip the ipkg/opkg steps.
Just do after everything
ln -s /usr/local/git/bin/git* /usr/bin/
Then it will work smoothly.