Fix build with custom prefix

distrho/src/DistrhoPluginLV2export.cpp

@@ -160,7 +160,7 @@ static const char* const lv2ManifestUiSupportedOptions[] =
 };
 #endif // DISTRHO_PLUGIN_HAS_UI
 
-static void addAttribute(DISTRHO::String& text,
+static void addAttribute(DISTRHO_NAMESPACE::String& text,
                          const char* const attribute,
                          const char* const values[],
                          const uint indent,

examples/Meters/ExampleUIMeters.cpp

@@ -18,11 +18,6 @@
 
 START_NAMESPACE_DISTRHO
 
-/**
-  We need the Color class from DGL.
- */
-using DGL::Color;
-
 /**
   Smooth meters a bit.
  */

examples/Parameters/ExampleUIParameters.cpp

@@ -18,11 +18,6 @@
 
 START_NAMESPACE_DISTRHO
 
-/**
-  We need the rectangle class from DGL.
- */
-using DGL::Rectangle;
-
 // -----------------------------------------------------------------------------------------------------------
 
 class ExampleUIParameters : public UI