You can clone with
HTTPS or Subversion.
doc: the build requires gcc 4.2 or newer
Hrmm... I can still compile node on my CentOS 5 boxes which still use gcc 4.1.2 ....
It may or may not build (I compiled with sunos gcc 3.4 in the past) but if it doesn't or you get strange crashes at run-time, we won't look into it.