That's normal - to build a 2.0 kernel you need a 2.0 userland ( or at 
   least 2.0 developer stuff ) - download the beta sets, upgrade your 
   system ( who needs isos besides for cold installs? ) - then the 2.0 


actually, you should be able to build 2.0 on most platforms...
see build.sh and the BUILDLING document.


.mrg.