Avoids this build error:
vendor/CppQuickCheck/include/cppqc/Generator.h:131:58:
error: member reference base type
'detail::StatelessGenConcept<T> *const' is not a structure or union

--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -182,6 +182,3 @@ IF(GTK2_FOUND)
   INSTALL(TARGETS tome-gtk2 RUNTIME DESTINATION bin)
 ENDIF()
 
-# test harness executable
-ADD_EXECUTABLE(harness ${SRCS_TESTS})
-TARGET_LINK_LIBRARIES(harness game squelch ${LIBS})