adjust prior commit to affect f28+ only

so branches remain mergeable

avahi.spec

@@ -38,9 +38,16 @@ BuildRequires:    automake
 BuildRequires:    libtool
 BuildRequires:    dbus-devel >= 0.90
 BuildRequires:    dbus-glib-devel >= 0.70
-BuildRequires:    python2-dbus
+%if 0%{?fedora} > 27
+%global python2_dbus python2-dbus
+%global python2_libxml2 python2-libxml2
+%else
+%global python2_dbus dbus-python
+%global python2_libxml2 libxml2-python
+%endif
+BuildRequires:    %{python2_dbus}
+BuildRequires;    %{python2_libxml2}
 BuildRequires:    desktop-file-utils
-BuildRequires:    python2-libxml2
 BuildRequires:    gtk2-devel
 BuildRequires:    gtk3-devel >= 2.99.0
 #BuildRequires:    gobject-introspection-devel
@@ -110,7 +117,7 @@ Requires:         openssh-clients
 Requires:         pygtk2
 Requires:         pygtk2-libglade
 Requires:         gdbm
-Requires:         python2-dbus
+Requires:         %{python2_dbus}
 
 %description ui-tools
 Graphical user interface tools that use Avahi to browse for mDNS services.