They have now merged. Fedora details here:
https://lists.fedoraproject.org/pipermail/devel/2012-June/168227.html
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}
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