diff --git a/lua51.changes b/lua51.changes
index 5790c57..8e542ac 100644
--- a/lua51.changes
+++ b/lua51.changes
@@ -1,3 +1,9 @@
+-------------------------------------------------------------------
+Mon Jul 24 12:08:05 UTC 2017 - dimstar@opensuse.org
+
+- Add INSLATT_LMOD and INSTALL_CMOD variables to lua53.pc: this is
+  queried for example by rrdtool's buildsystem.
+
 -------------------------------------------------------------------
 Thu Jul 20 12:36:41 UTC 2017 - tchvatal@suse.com
 
diff --git a/lua51.spec b/lua51.spec
index dc050bc..8dee17f 100644
--- a/lua51.spec
+++ b/lua51.spec
@@ -138,6 +138,8 @@ prefix=%{_prefix}
 exec_prefix=%{_prefix}
 libdir=%{_libdir}
 includedir=%{_prefix}/include/lua%{major_version}
+INSTALL_LMOD=%{_datadir}/lua/%{major_version}
+INSTALL_CMOD=%{_libdir}/lua/%{major_version}
 
 Name: Lua %{major_version}
 Description: An Extensible Extension Language