This package appears to include a private copy of valgrind.h. In the latest relase of valgrind 3.10.0 a bug was fixed for ppc32 and support was added for aarch64 and ppc64le. Please either update the private copy of valgrind.h (memcheck.h, callgrind.h, etc) or (better) make your package BuildRequires: valgrind-devel and use the system installed headers.
realmd-0.15.2-1.fc21 has been submitted as an update for Fedora 21. https://admin.fedoraproject.org/updates/FEDORA-2014-12431/realmd-0.15.2-1.fc21
realmd-0.15.2-1.fc21 has been pushed to the Fedora 21 stable repository. If problems still persist, please make note of it in this bug report.