Hello,
  I tried to improve the autoconfigury in frysk-imports, which calls
libunwind/configure several times.
  I decided to stick with documented interface of autoconf, so I
worked hard to avoid using the ac_configure_args variable in
frysk-imports/configure.ac.  I decided to use wrapper scripts around
libunwind/configure.
  But the result does not look as nice as I expected.
  In any case, I was not able to finish it so far.  The current
version of the patch is attached below, in case you are interested.

Sorry,
	Stepan