diff --git a/Makefile b/Makefile
index d2fe528..89cd67d 100644
--- a/Makefile
+++ b/Makefile
@@ -118,3 +118,5 @@ include Makefile.rules
 #add dependency on custom makefile filename
 dep/%.d: %.c Makefile
 
+listvariants:
+	@echo VARIANTS NONE openpgp