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-rw-r--r--src/extension/internal/filter/filter.h9
1 files changed, 9 insertions, 0 deletions
diff --git a/src/extension/internal/filter/filter.h b/src/extension/internal/filter/filter.h
index 08bc1c3f0..1e8a3be0f 100644
--- a/src/extension/internal/filter/filter.h
+++ b/src/extension/internal/filter/filter.h
@@ -8,11 +8,20 @@
* Released under GNU GPL, read the file 'COPYING' for more information
*/
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
#include <glibmm/i18n.h>
#include "extension/implementation/implementation.h"
namespace Inkscape {
+
+namespace XML {
+ class Document;
+}
+
namespace Extension {
class Effect;