On Wed, Dec 04, 2002 at 12:44:44PM +0000, David Laight wrote:
  | I 'fixed' the source files and Makefiles to make the code I had
  | compile.  My ISP was dead at the time the build failed, so I couldn't
  | see what changes had caused the problem.
  | 
  | I didn't try deleting the obj/tools directory (usually needed
  | after a kernel version change).

ISTM that the autoconf cache should probably be invalidated if the
configure script or config.h.in is newer.

(I don't know that will cause too many reconfigure-s though).