--- vdk2-2.4.0.orig/vdk/entry.cc
+++ vdk2-2.4.0/vdk/entry.cc
@@ -30,6 +30,9 @@
 #include "vdk/forms.h"
 #include "vdk/colors.h"
 #include <string>
+
+#include <cstring>
+
 static void
 EntryChanged(GtkWidget* wid, gpointer gp)
 {
--- vdk2-2.4.0.orig/vdk/image.cc
+++ vdk2-2.4.0/vdk/image.cc
@@ -38,6 +38,9 @@
 #define DEFAULT_ICON_SIZE GTK_ICON_SIZE_BUTTON
 #include "gtk/gtkstock.h"
 #include "gtk/gtkiconfactory.h"
+
+#include <cstring>
+
 static void
 x_gtk_image_update_size (GtkImage *image,
                        gint      image_width,
--- vdk2-2.4.0.orig/vdk/vdkdate.cc
+++ vdk2-2.4.0/vdk/vdkdate.cc
@@ -32,6 +32,8 @@
 #include <cstdio>
 #include <time.h>
 
+#include <cstring>
+
 /*
 days, moths, names
 */