-BuildRequires: gettext-devel >= 0.10.40
-BuildRequires: glib2-devel >= 1:2.26.0
-BuildRequires: gtk+2-devel >= 2:2.18.0
+BuildRequires: gettext-tools >= 0.10.40
+BuildRequires: glib2-devel >= 1:2.36.0
+BuildRequires: gobject-introspection-devel >= 0.9.3
+%{!?with_gtk3:BuildRequires: gtk+2-devel >= 2:2.18.0}
+%{?with_gtk3:BuildRequires: gtk+3-devel >= 3.0.0}