R-qtl-debuginfo-1.31.9-1 does not contain sources. Build log doesn't contain the usual suspects for this, so closer examination is needed.
Rebuilding the same src rpm on F20 produces a debuginfo rpm that does contain the sources, so I do not believe there is something broken in the packaging.
R 3.1.1-1 was built without LTO. R-qtl 1.32.10-4 was built against it and the debuginfo package now contains sources.