GCC 4.5 compatibility: no nullptr here.

src/Platform/ScreenedApplication.h

@@ -97,7 +97,11 @@ template<class Application> class BasicScreenedApplication: public Application,
         explicit BasicScreenedApplication(const typename Application::Arguments& arguments, const typename Application::Configuration& configuration = Application::Configuration());
 
         /** @copydoc Sdl2Application::Sdl2Application(const Arguments&, std::nullptr_t) */
+        #ifndef CORRADE_GCC45_COMPATIBILITY
         explicit BasicScreenedApplication(const typename Application::Arguments& arguments, std::nullptr_t);
+        #else
+        explicit BasicScreenedApplication(const typename Application::Arguments& arguments, void*);
+        #endif
 
         /**
          * @brief Add screen to application

src/Platform/ScreenedApplication.hpp

@@ -43,7 +43,12 @@ template<class Application> void BasicScreen<Application>::mouseMoveEvent(MouseM
 
 template<class Application> BasicScreenedApplication<Application>::BasicScreenedApplication(const typename Application::Arguments& arguments, const typename Application::Configuration& configuration): Application(arguments, configuration) {}
 
-template<class Application> BasicScreenedApplication<Application>::BasicScreenedApplication(const typename Application::Arguments& arguments, std::nullptr_t): Application(arguments, nullptr) {}
+#ifndef CORRADE_GCC45_COMPATIBILITY
+template<class Application> BasicScreenedApplication<Application>::BasicScreenedApplication(const typename Application::Arguments& arguments, std::nullptr_t):
+#else
+template<class Application> BasicScreenedApplication<Application>::BasicScreenedApplication(const typename Application::Arguments& arguments, void*):
+#endif
+    Application(arguments, nullptr) {}
 
 template<class Application> BasicScreenedApplication<Application>::~BasicScreenedApplication() = default;