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Calling ./configure with python3 being there but no python, tools/configure will fail. Fix that by defaulting to python and falling back to python3 or python2. While at it fix the use of non portable "type -p" by replacing it by AC_PATH_PROG(). Signed-off-by: Juergen Gross <jgross@suse.com> Acked-by: Wei Liu <wl@xen.org> [ wei: run autogen.sh ] Reviewed-by: Ian Jackson <ian.jackson@eu.citrix.com>