Hi, I am the darktable co-maintainer for Fedora
I tried to test darktable 2.0.x on EPEL7, but the build will fail due an old version of pugixml

https://copr-be.cloud.fedoraproject.org/results/germano/Darktable_2.0_release_candidate/epel-7-x86_64/00165100-darktable/build.log.gz