diff --git a/fftw3.changes b/fftw3.changes
index 17527b6..f180b3c 100644
--- a/fftw3.changes
+++ b/fftw3.changes
@@ -1,3 +1,9 @@
+-------------------------------------------------------------------
+Tue Oct 17 13:23:12 UTC 2017 - eich@suse.com
+
+- Add magic to limit the number of flavors built in the
+  in the OBS ring.
+
 -------------------------------------------------------------------
 Sat Oct 14 17:13:06 UTC 2017 - eich@suse.com
 
diff --git a/fftw3.spec b/fftw3.spec
index 02a706a..a0b4bca 100644
--- a/fftw3.spec
+++ b/fftw3.spec
@@ -24,11 +24,21 @@
 %define vers 3.3.5
 %define _ver 3_3_5
 
+%bcond_with ringdisabled
+
 %if "%flavor" == ""
 ExclusiveArch:  do_not_build
 %define package_name %pname
 %endif
 
+# Magic for OBS Staging. Only build the flavors required by
+# other packages in the ring.
+%if %{with ringdisabled}
+ %if "%flavor" != "standard"
+ExclusiveArch:  do_not_build
+ %endif
+%endif
+
 %if "%{flavor}" == "standard"
 %define mpi_flavor standard
 %bcond_without mpi