You can just go to the preferences dialog via Tools |
Options and then go to the Version Control section. From
here, you can tell RStudio the location of your git executable (the
bin directory). All we're doing is calling git and this needs to be
in the search path so we can find it.
Also cygwin will not work as it actually has a different way of
handeling ssh. You could technically reconfigure this and set it up
to work with cygwin, but this will involve a bit of work and we're
not familiar with all the details necessary to do so.