Support for the ARM 64 bit CPU architecture (aarch64) was introduced in autoconf 2.69. rsnapshot 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/rsnapshot/rsnapshot-aarch64.patch which updates config.guess and config.sub to recognize aarch64.
This package has changed ownership in the Fedora Package Database. Reassigning to the new owner of this component.
Option #1 isn't viable as 2.69 is a very recent autconf version and the package needs to maintain compatibility with older autoconf's. for example even RHEL 6 ships with autoconf 2.63. discussed with upstream and option #2 does seem viable though. I'll plan on getting that in soon.