https://bugzilla.redhat.com/show_bug.cgi?id=868578
--- Comment #2 from Denis Arnaud denis.arnaud_fedora@m4x.org --- Thanks Volker for the review. I will have a look at it shortly and publish the amended versions of the package. For the compiler flags (you are right; thanks to have spotted it), I will have some work to do, though, as the Makefile needs to be patched.
Apparently, upstream is no longer maintained (there has been no activity for 2 years already). However, RE2 seems to have reached a mature enough state, thus avoiding the need to be actively maintained...
Note that I will strive to maintain that package also on EPEL (5 and 6).