diff --git a/src/Platform/AbstractXApplication.cpp b/src/Platform/AbstractXApplication.cpp
index 8a7a1217a..a44881ba5 100644
--- a/src/Platform/AbstractXApplication.cpp
+++ b/src/Platform/AbstractXApplication.cpp
@@ -46,7 +46,12 @@ AbstractXApplication::AbstractXApplication(AbstractContextHandler<Display*, Visu
     createContext({});
 }
 
-AbstractXApplication::AbstractXApplication(AbstractContextHandler<Display*, VisualID, Window>* contextHandler, const Arguments&, std::nullptr_t): contextHandler(contextHandler), c(nullptr), flags(Flag::Redraw) {}
+#ifndef CORRADE_GCC45_COMPATIBILITY
+AbstractXApplication::AbstractXApplication(AbstractContextHandler<Display*, VisualID, Window>* contextHandler, const Arguments&, std::nullptr_t)
+#else
+AbstractXApplication::AbstractXApplication(AbstractContextHandler<Display*, VisualID, Window>* contextHandler, const Arguments&, void*)
+#endif
+    : contextHandler(contextHandler), c(nullptr), flags(Flag::Redraw) {}
 
 void AbstractXApplication::createContext(const Configuration& configuration) {
     CORRADE_ASSERT(!c, "AbstractXApplication::createContext(): context already created", );
diff --git a/src/Platform/AbstractXApplication.h b/src/Platform/AbstractXApplication.h
index bf9b46a29..ab3609b7d 100644
--- a/src/Platform/AbstractXApplication.h
+++ b/src/Platform/AbstractXApplication.h
@@ -94,7 +94,11 @@ class AbstractXApplication {
          * Unlike above, the context is not created and must be created later
          * with createContext() or tryCreateContext().
          */
+        #ifndef CORRADE_GCC45_COMPATIBILITY
         explicit AbstractXApplication(AbstractContextHandler<Display*, VisualID, Window>* contextHandler, const Arguments& arguments, std::nullptr_t);
+        #else
+        explicit AbstractXApplication(AbstractContextHandler<Display*, VisualID, Window>* contextHandler, const Arguments& arguments, void*);
+        #endif
 
         /**
          * @brief Execute main loop
diff --git a/src/Platform/GlutApplication.cpp b/src/Platform/GlutApplication.cpp
index fb92c6c3e..c4f3faa64 100644
--- a/src/Platform/GlutApplication.cpp
+++ b/src/Platform/GlutApplication.cpp
@@ -43,7 +43,13 @@ GlutApplication::GlutApplication(const Arguments& arguments): c(nullptr) {
     createContext({});
 }
 
-GlutApplication::GlutApplication(const Arguments& arguments, std::nullptr_t): c(nullptr) {
+#ifndef CORRADE_GCC45_COMPATIBILITY
+GlutApplication::GlutApplication(const Arguments& arguments, std::nullptr_t)
+#else
+GlutApplication::GlutApplication(const Arguments& arguments, void*)
+#endif
+    : c(nullptr)
+{
     initialize(arguments.argc, arguments.argv);
 }
 
diff --git a/src/Platform/GlutApplication.h b/src/Platform/GlutApplication.h
index e037a849b..245eab58b 100644
--- a/src/Platform/GlutApplication.h
+++ b/src/Platform/GlutApplication.h
@@ -103,7 +103,11 @@ class GlutApplication {
          * Unlike above, the context is not created and must be created later
          * with createContext() or tryCreateContext().
          */
+        #ifndef CORRADE_GCC45_COMPATIBILITY
         explicit GlutApplication(const Arguments& arguments, std::nullptr_t);
+        #else
+        explicit GlutApplication(const Arguments& arguments, void*);
+        #endif
 
         /**
          * @brief Execute main loop
diff --git a/src/Platform/GlxApplication.h b/src/Platform/GlxApplication.h
index b3aeb562a..136cf75a0 100644
--- a/src/Platform/GlxApplication.h
+++ b/src/Platform/GlxApplication.h
@@ -60,7 +60,12 @@ class GlxApplication: public AbstractXApplication {
         explicit GlxApplication(const Arguments& arguments, const Configuration& configuration = Configuration()): AbstractXApplication(new GlxContextHandler, arguments, configuration) {}
 
         /** @copydoc GlutApplication::GlutApplication(const Arguments&, std::nullptr_t) */
-        explicit GlxApplication(const Arguments& arguments, std::nullptr_t): AbstractXApplication(new GlxContextHandler, arguments, nullptr) {}
+        #ifndef CORRADE_GCC45_COMPATIBILITY
+        explicit GlxApplication(const Arguments& arguments, std::nullptr_t)
+        #else
+        explicit GlxApplication(const Arguments& arguments, void*)
+        #endif
+            : AbstractXApplication(new GlxContextHandler, arguments, nullptr) {}
 
     protected:
         /* Nobody will need to have (and delete) GlxApplication*, thus this is
diff --git a/src/Platform/NaClApplication.cpp b/src/Platform/NaClApplication.cpp
index b4a5ba4c2..2868b90d1 100644
--- a/src/Platform/NaClApplication.cpp
+++ b/src/Platform/NaClApplication.cpp
@@ -61,7 +61,13 @@ NaClApplication::NaClApplication(const Arguments& arguments): Instance(arguments
     createContext({});
 }
 
-NaClApplication::NaClApplication(const Arguments& arguments, std::nullptr_t): Instance(arguments), Graphics3DClient(this), MouseLock(this), c(nullptr)  {
+#ifndef CORRADE_GCC45_COMPATIBILITY
+NaClApplication::NaClApplication(const Arguments& arguments, std::nullptr_t)
+#else
+NaClApplication::NaClApplication(const Arguments& arguments, void*)
+#endif
+    : Instance(arguments), Graphics3DClient(this), MouseLock(this), c(nullptr)
+{
     debugOutput = new ConsoleDebugOutput(this);
 }
 
diff --git a/src/Platform/NaClApplication.h b/src/Platform/NaClApplication.h
index 367baad35..eddd28306 100644
--- a/src/Platform/NaClApplication.h
+++ b/src/Platform/NaClApplication.h
@@ -147,7 +147,11 @@ class NaClApplication: public pp::Instance, public pp::Graphics3DClient, public
         #endif
 
         /** @copydoc GlutApplication::GlutApplication(const Arguments&, std::nullptr_t) */
+        #ifndef CORRADE_GCC45_COMPATIBILITY
         explicit NaClApplication(const Arguments& arguments, std::nullptr_t);
+        #else
+        explicit NaClApplication(const Arguments& arguments, void*);
+        #endif
 
         /** @brief Whether the application runs fullscreen */
         bool isFullscreen();
diff --git a/src/Platform/Sdl2Application.cpp b/src/Platform/Sdl2Application.cpp
index 734f6312c..9cde00102 100644
--- a/src/Platform/Sdl2Application.cpp
+++ b/src/Platform/Sdl2Application.cpp
@@ -59,7 +59,13 @@ Sdl2Application::Sdl2Application(const Arguments&): context(nullptr), flags(Flag
     createContext({});
 }
 
-Sdl2Application::Sdl2Application(const Arguments&, std::nullptr_t): context(nullptr), flags(Flag::Redraw) {
+#ifndef CORRADE_GCC45_COMPATIBILITY
+Sdl2Application::Sdl2Application(const Arguments&, std::nullptr_t)
+#else
+Sdl2Application::Sdl2Application(const Arguments&, void*)
+#endif
+    : context(nullptr), flags(Flag::Redraw)
+{
     initialize();
 }
 
diff --git a/src/Platform/Sdl2Application.h b/src/Platform/Sdl2Application.h
index 1fd62c431..9f6851cf9 100644
--- a/src/Platform/Sdl2Application.h
+++ b/src/Platform/Sdl2Application.h
@@ -90,7 +90,11 @@ class Sdl2Application {
         #endif
 
         /** @copydoc GlutApplication::GlutApplication(const Arguments&, std::nullptr_t) */
+        #ifndef CORRADE_GCC45_COMPATIBILITY
         explicit Sdl2Application(const Arguments& arguments, std::nullptr_t);
+        #else
+        explicit Sdl2Application(const Arguments& arguments, void*);
+        #endif
 
         /** @copydoc GlutApplication::exec() */
         int exec();
diff --git a/src/Platform/WindowlessGlxApplication.cpp b/src/Platform/WindowlessGlxApplication.cpp
index 00fe92feb..a439e5496 100644
--- a/src/Platform/WindowlessGlxApplication.cpp
+++ b/src/Platform/WindowlessGlxApplication.cpp
@@ -43,7 +43,12 @@ WindowlessGlxApplication::WindowlessGlxApplication(const Arguments&): c(nullptr)
     createContext({});
 }
 
-WindowlessGlxApplication::WindowlessGlxApplication(const Arguments&, std::nullptr_t): c(nullptr) {}
+#ifndef CORRADE_GCC45_COMPATIBILITY
+WindowlessGlxApplication::WindowlessGlxApplication(const Arguments&, std::nullptr_t)
+#else
+WindowlessGlxApplication::WindowlessGlxApplication(const Arguments&, void*)
+#endif
+    : c(nullptr) {}
 
 void WindowlessGlxApplication::createContext(const Configuration&) {
     CORRADE_ASSERT(!c, "WindowlessGlxApplication::createContext(): context already created", );
diff --git a/src/Platform/WindowlessGlxApplication.h b/src/Platform/WindowlessGlxApplication.h
index ed9831b83..9d4924c64 100644
--- a/src/Platform/WindowlessGlxApplication.h
+++ b/src/Platform/WindowlessGlxApplication.h
@@ -83,7 +83,11 @@ class WindowlessGlxApplication {
         #endif
 
         /** @copydoc GlutApplication::GlutApplication(const Arguments&, std::nullptr_t) */
+        #ifndef CORRADE_GCC45_COMPATIBILITY
         explicit WindowlessGlxApplication(const Arguments& arguments, std::nullptr_t);
+        #else
+        explicit WindowlessGlxApplication(const Arguments& arguments, void*);
+        #endif
 
         /**
          * @brief Execute application
diff --git a/src/Platform/WindowlessNaClApplication.cpp b/src/Platform/WindowlessNaClApplication.cpp
index 5336ba23c..34a2d4f5f 100644
--- a/src/Platform/WindowlessNaClApplication.cpp
+++ b/src/Platform/WindowlessNaClApplication.cpp
@@ -60,7 +60,13 @@ WindowlessNaClApplication::WindowlessNaClApplication(const Arguments& arguments)
     createContext({});
 }
 
-WindowlessNaClApplication::WindowlessNaClApplication(const Arguments& arguments, std::nullptr_t): Instance(arguments), Graphics3DClient(this), graphics(nullptr), c(nullptr) {
+#ifndef CORRADE_GCC45_COMPATIBILITY
+WindowlessNaClApplication::WindowlessNaClApplication(const Arguments& arguments, std::nullptr_t)
+#else
+WindowlessNaClApplication::WindowlessNaClApplication(const Arguments& arguments, void*)
+#endif
+    : Instance(arguments), Graphics3DClient(this), graphics(nullptr), c(nullptr)
+{
     debugOutput = new ConsoleDebugOutput(this);
 }
 
diff --git a/src/Platform/WindowlessNaClApplication.h b/src/Platform/WindowlessNaClApplication.h
index 1fe6e6b81..9ff3a4b2a 100644
--- a/src/Platform/WindowlessNaClApplication.h
+++ b/src/Platform/WindowlessNaClApplication.h
@@ -100,7 +100,11 @@ class WindowlessNaClApplication: public pp::Instance, public pp::Graphics3DClien
         #endif
 
         /** @copydoc GlutApplication::GlutApplication(const Arguments&, std::nullptr_t) */
+        #ifndef CORRADE_GCC45_COMPATIBILITY
         explicit WindowlessNaClApplication(const Arguments& arguments, std::nullptr_t);
+        #else
+        explicit WindowlessNaClApplication(const Arguments& arguments, void*);
+        #endif
 
         /**
          * @brief Execute application
diff --git a/src/Platform/XEglApplication.h b/src/Platform/XEglApplication.h
index 1b99b87f1..8eb94415f 100644
--- a/src/Platform/XEglApplication.h
+++ b/src/Platform/XEglApplication.h
@@ -60,7 +60,12 @@ class XEglApplication: public AbstractXApplication {
         explicit XEglApplication(const Arguments& arguments, const Configuration& configuration = Configuration()): AbstractXApplication(new EglContextHandler, arguments, configuration) {}
 
         /** @copydoc GlutApplication::GlutApplication(const Arguments&, std::nullptr_t) */
-        explicit XEglApplication(const Arguments& arguments, std::nullptr_t): AbstractXApplication(new EglContextHandler, nullptr) {}
+        #ifndef CORRADE_GCC45_COMPATIBILITY
+        explicit XEglApplication(const Arguments& arguments, std::nullptr_t)
+        #else
+        explicit XEglApplication(const Arguments& arguments, void*)
+        #endif
+            : AbstractXApplication(new EglContextHandler, nullptr) {}
 
     protected:
         /* Nobody will need to have (and delete) XEglApplication*, thus this is