WKGR='10.7.5_x86_xnu'
TARS='
http://www.opensource.apple.com/tarballs/IOKitUser/IOKitUser-647.35.tar.gz
http://www.opensource.apple.com/tarballs/cctools/cctools-800.tar.gz
http://www.opensource.apple.com/tarballs/kext_tools/kext_tools-252.3.tar.gz
http://www.opensource.apple.com/tarballs/xnu/xnu-1699.32.7.tar.gz
'
[ -d "$WKGR" ] || mkdir "$WKGR"	;
(cd "$WKGR" &&
for f in $TARS; do
  curl -RO -C - "$f"
done
)