They have now merged. Fedora details here:
https://lists.fedoraproject.org/pipermail/devel/2012-June/168227.html
Signed-off-by: Cole Robinson <crobinso(a)redhat.com>
---
libvirt.spec.in | 8 ++++++++
1 files changed, 8 insertions(+), 0 deletions(-)
diff --git a/libvirt.spec.in b/libvirt.spec.in
index 3c544f1..a78b117 100644
--- a/libvirt.spec.in
+++ b/libvirt.spec.in
@@ -355,7 +355,11 @@ BuildRequires: augeas
BuildRequires: hal-devel
%endif
%if %{with_udev}
+%if 0%{?fedora} >= 18 || 0%{?rhel} >= 7
+BuildRequires: systemd-devel >= 185
+%else
BuildRequires: libudev-devel >= 145
+%endif
BuildRequires: libpciaccess-devel >= 0.10.9
%endif
%if %{with_yajl}
@@ -539,8 +543,12 @@ Requires: ebtables
Requires: hal
%endif
%if %{with_udev}
+%if 0%{?fedora} >= 18 || 0%{?rhel} >= 7
+Requires: systemd >= 185
+%else
Requires: udev >= 145
%endif
+%endif
%if %{with_polkit}
%if 0%{?fedora} >= 12 || 0%{?rhel} >=6
Requires: polkit >= 0.93
--
1.7.7.6