Ensure %{_unitdir} is defined, to fix the build.

polkit.spec

@@ -6,7 +6,7 @@
 Summary: An authorization framework
 Name: polkit
 Version: 0.112
-Release: 10%{?dist}
+Release: 11%{?dist}
 License: LGPLv2+
 URL: http://www.freedesktop.org/wiki/Software/polkit
 Source0: http://www.freedesktop.org/software/polkit/releases/%{name}-%{version}.tar.gz
@@ -29,7 +29,7 @@ BuildRequires: pam-devel
 BuildRequires: gtk-doc
 BuildRequires: intltool
 BuildRequires: gobject-introspection-devel
-BuildRequires: systemd-devel
+BuildRequires: systemd, systemd-devel
 BuildRequires: mozjs17-devel
 
 %if 0%{?enable_autoreconf}
@@ -190,6 +190,9 @@ exit 0
 %{_libdir}/girepository-1.0/*.typelib
 
 %changelog
+* Fri Jun 19 2015 Miloslav Trmač <mitr@redhat.com> - 0.112-11
+- Add BuildRequires: systemd so that %%{_unitdir} is defined, to fix the build.
+
 * Thu Jun 18 2015 Fedora Release Engineering <rel-eng@lists.fedoraproject.org> - 0.112-10
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_23_Mass_Rebuild