GCC doesn't like forward-declared shared pointers as default args, CLang does.

src/libtomahawk/aclsystem.cpp

@@ -21,7 +21,7 @@
 #include <QMutexLocker>
 #include <QVariant>
 
-#include <tomahawksettings.h>
+#include "tomahawksettings.h"
 
 #include "utils/logger.h"
 

src/libtomahawk/database/databasecommand_allalbums.h

@@ -22,9 +22,11 @@
 #include <QObject>
 #include <QVariantMap>
 
+#include "album.h"
+#include "artist.h"
+#include "collection.h"
 #include "typedefs.h"
 #include "databasecommand.h"
-#include "album.h"
 
 #include "dllmacro.h"
 

src/libtomahawk/database/databasecommand_allartists.h

@@ -22,6 +22,7 @@
 #include <QObject>
 #include <QVariantMap>
 
+#include "artist.h"
 #include "typedefs.h"
 #include "databasecommand.h"
 

src/libtomahawk/playlist.h

@@ -28,6 +28,7 @@
 #include "typedefs.h"
 #include "result.h"
 #include "playlistinterface.h"
+#include "query.h"
 
 #include "dllmacro.h"
 

src/libtomahawk/viewmanager.h

@@ -23,6 +23,7 @@
 #include <QHash>
 #include <QStackedWidget>
 
+#include "artist.h"
 #include "collection.h"
 #include "playlistinterface.h"
 #include "playlist/queueview.h"