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diff --git a/src/extension/db.h b/src/extension/db.h
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+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Functions to keep a listing of all modules in the system.  Has its
+ * own file mostly for abstraction reasons, but is pretty simple
+ * otherwise.
+ *
+ * Authors:
+ *   Ted Gould <ted@gould.cx>
+ *   Lauris Kaplinski <lauris@kaplinski.com>
+ *
+ * Copyright (C) 2002-2004 Authors
+ *
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#ifndef SEEN_MODULES_DB_H
+#define SEEN_MODULES_DB_H
+
+#include <map>
+#include <list>
+#include <cstring>
+
+#include <glib.h>
+
+
+namespace Inkscape {
+namespace Extension {
+
+class Input;
+class Output;
+class Effect;
+class Extension;
+
+class DB {
+private:
+    /** A string comparison function to be used in the moduledict
+        to find the different extensions in the hash map. */
+    struct ltstr {
+        bool operator()(const char* s1, const char* s2) const {
+            if ( (s1 == nullptr) && (s2 != nullptr) ) {
+                return true;
+            } else if (s1 == nullptr || s2 == nullptr) {
+                return false;
+            } else {
+                return strcmp(s1, s2) < 0;
+            }
+        }
+    };
+    /** This is the actual database.  It has all of the modules in it,
+        indexed by their ids.  It's a hash table for faster lookups */
+    std::map <const char *, Extension *, ltstr> moduledict;
+    /** Maintain an ordered list of modules for generating the extension
+        lists via "foreach" */
+    std::list <Extension *> modulelist;
+
+    static void foreach_internal (gpointer in_key, gpointer in_value, gpointer in_data);
+
+public:
+    DB ();
+    Extension * get (const gchar *key) const;
+    void register_ext (Extension *module);
+    void unregister_ext (Extension *module);
+    void foreach (void (*in_func)(Extension * in_plug, gpointer in_data), gpointer in_data);
+
+private:
+    static void input_internal (Extension * in_plug, gpointer data);
+    static void output_internal (Extension * in_plug, gpointer data);
+    static void effect_internal (Extension * in_plug, gpointer data);
+
+public:
+    typedef std::list<Output *> OutputList;
+    typedef std::list<Input *> InputList;
+    typedef std::list<Effect *> EffectList;
+
+    InputList  &get_input_list  (InputList &ou_list);
+    OutputList &get_output_list (OutputList &ou_list);
+    EffectList &get_effect_list (EffectList &ou_list);
+}; /* class DB */
+
+extern DB db;
+
+} } /* namespace Extension, Inkscape */
+
+#endif // SEEN_MODULES_DB_H
+
+/*
+  Local Variables:
+  mode:c++
+  c-file-style:"stroustrup"
+  c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
+  indent-tabs-mode:nil
+  fill-column:99
+  End:
+*/
+// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :