Add missing dependency in devel package

lv2.spec

@@ -2,7 +2,7 @@
 
 Name:           lv2
 Version:        1.14.0
-Release:        8%{?dist}
+Release:        9%{?dist}
 Summary:        Audio Plugin Standard
 
 # lv2specgen template.html is CC-AT-SA
@@ -40,6 +40,7 @@ LADSPA which many hosts have outgrown.
 Summary:        API for the LV2 Audio Plugin Standard
 
 Requires:       %{name}%{?_isa} = %{version}-%{release}
+Requires:       python2-rdflib
 Provides:       lv2core-devel = 6.0-4
 Obsoletes:      lv2core-devel < 6.0-4
 Provides:       lv2-ui-devel = 2.4-5
@@ -118,6 +119,9 @@ done
 %{_pkgdocdir}/
 
 %changelog
+* Tue Feb 19 2019 Guido Aulisi <guido.aulisi@gmail.com> - 1.14.0-9
+- Add missing dependency in devel package
+
 * Fri Feb 01 2019 Fedora Release Engineering <releng@fedoraproject.org> - 1.14.0-8
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_30_Mass_Rebuild