Support for the ARM 64 bit CPU architecture (aarch64) was introduced in autoconf 2.69. pen 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/pen/pen-aarch64.patch which updates config.guess and config.sub to recognize aarch64.
WRT #1, pen 0.20.1 uses autoconf 2.69. Signed, "Upstream"
pen-0.20.2-1.fc20 has been submitted as an update for Fedora 20. https://admin.fedoraproject.org/updates/pen-0.20.2-1.fc20
pen-0.20.2-1.el6 has been submitted as an update for Fedora EPEL 6. https://admin.fedoraproject.org/updates/pen-0.20.2-1.el6
Package pen-0.20.2-1.el6: * should fix your issue, * was pushed to the Fedora EPEL 6 testing repository, * should be available at your local mirror within two days. Update it with: # su -c 'yum update --enablerepo=epel-testing pen-0.20.2-1.el6' as soon as you are able to. Please go to the following url: https://admin.fedoraproject.org/updates/FEDORA-EPEL-2014-0364/pen-0.20.2-1.el6 then log in and leave karma (feedback).
pen-0.20.2-1.fc20 has been pushed to the Fedora 20 stable repository. If problems still persist, please make note of it in this bug report.
pen-0.20.2-1.el6 has been pushed to the Fedora EPEL 6 stable repository. If problems still persist, please make note of it in this bug report.