GCC 4.4 compatibility: no lambda functions.

src/SceneGraph/Object.h

@@ -215,6 +215,13 @@ template<class Transformation> class Object: public AbstractObject<Transformatio
         void setClean() override;
 
     private:
+        /* GCC 4.4 doesn't support lambda functions */
+        #ifndef DOXYGEN_GENERATING_OUTPUT
+        struct DirtyCheck {
+            inline bool operator()(Object<Transformation>* o) const { return !o->isDirty(); }
+        };
+        #endif
+
         Object<Transformation>* sceneObject() override;
         const Object<Transformation>* sceneObject() const override;
 

src/SceneGraph/Object.hpp

@@ -265,7 +265,7 @@ template<class Transformation> void Object<Transformation>::setClean(const std::
 
 template<class Transformation> void Object<Transformation>::setClean(std::vector<Object<Transformation>*> objects) {
     /* Remove all clean objects from the list */
-    auto firstClean = std::remove_if(objects.begin(), objects.end(), [](Object<Transformation>* o) { return !o->isDirty(); });
+    auto firstClean = std::remove_if(objects.begin(), objects.end(), DirtyCheck());
     objects.erase(firstClean, objects.end());
 
     /* No dirty objects left, done */