-cp $config /tmp/linux.config
-rm -rf /tmp/linux-$kerver
-tar xfj ./download/base/linux/$kerpkg -C /tmp
-cd /tmp/linux-$kerver
+cp $config $builddir/linux.config
+rm -rf $builddir/linux-$kerver
+tar xfj ./download/base/linux/$kerpkg -C $builddir
+cd $builddir/linux-$kerver