--- spack-src/test/prototype_factory_test.cpp.org	2020-02-07 11:17:24.321582233 +0900
+++ spack-src/test/prototype_factory_test.cpp	2020-02-07 11:18:25.598262173 +0900
@@ -58,6 +58,7 @@
   virtual clone_type clone(int a) = 0;
   virtual clone_type clone(int a, int b) = 0;
   virtual int get() = 0;
+  virtual ~BaseMultiParms() {}
 };
 
 class DerivedSum : public BaseMultiParms {
@@ -121,4 +122,4 @@
   auto objb = factory.create(0, 3, 6);
   BOOST_CHECK_EQUAL(objb->get(), 9);
 }
-BOOST_AUTO_TEST_SUITE_END()
\ No newline at end of file
+BOOST_AUTO_TEST_SUITE_END()