WKGR='10.6.8_x86_xnu'
TARS='
http://www.opensource.apple.com/tarballs/IOKitUser/IOKitUser-514.16.50.tar.gz
http://www.opensource.apple.com/tarballs/cctools/cctools-750.tar.gz
http://www.opensource.apple.com/tarballs/xnu/xnu-1504.15.3.tar.gz
'
[ -d "$WKGR" ] || mkdir "$WKGR"	;
(cd "$WKGR"	&&
for f in $TARS; do
  curl -RO -C - "$f"
done
)