diff -up konqueror-18.12.2/CMakeLists.txt.webengine_optinal konqueror-18.12.2/CMakeLists.txt
--- konqueror-18.12.2/CMakeLists.txt.webengine_optinal	2019-02-20 10:00:56.759740582 -0600
+++ konqueror-18.12.2/CMakeLists.txt	2019-02-20 10:02:25.744522748 -0600
@@ -56,7 +56,9 @@ add_subdirectory( client )
 if(BUILD_TESTING)
     add_subdirectory( autotests )
 endif()
+if (Qt5WebEngineWidgets_FOUND)
 add_subdirectory( webenginepart )
+endif()
 
 add_subdirectory( about )
 add_subdirectory( pics )