Support for the ARM 64 bit CPU architecture (aarch64) was introduced in autoconf 2.69. amtu 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/amtu/amtu-aarch64.patch which updates config.guess and config.sub to recognize aarch64.
AMTU was never intended for the ARM architecture. It has in its spec file: ExclusiveArch: i386 i686 x86_64 ppc ppc64 s390 s390x ia64 And it will likely be abandoned in F20, so its not worth wasting time on. Closing this bug report since AMTU is about at its end and it was never meant for ARM systems.