Support for the ARM 64 bit CPU architecture (aarch64) was introduced in autoconf 2.69. apr-util appears to use an earlier version of autoconf, preventing its being built. This can be fixed in of three ways (In order of preference): 1. Work with upstream to migrate the package to autoconf 2.69. 2. Rerun autoconf or autoreconf in %prep or %build prior to running configure. 3. Apply the patch at http://ausil.fedorapeople.org/aarch64/apr-util/apr-util-aarch64.patch which updates config.guess and config.sub to recognize aarch64.
Commit: http://pkgs.fedoraproject.org/gitweb/?p=apr-util.git;a=commitdiff;h=3922163c5e7a424838481f7b4957bb7ad1380bfa Package: apr-util-1.5.2-2.fc19 Build: https://koji.fedoraproject.org/koji/buildinfo?buildID=410374
btw you can drop the config.guess patch as it's now automatically done as part of the %configure macro