Support for the ARM 64 bit CPU architecture (aarch64) was introduced in autoconf 2.69. libosip2 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/libosip2/libosip2-aarch64.patch which updates config.guess and config.sub to recognize aarch64.
Patch applied, running autoreconf fails.
Can you build for F19 too please?
libosip2-3.6.0-5.fc19 built