diff --git a/src/beval.h b/src/beval.h
new file mode 100644
index 0000000..d157a9e
--- /dev/null
+++ b/src/beval.h
@@ -0,0 +1,83 @@
+/* vi:set ts=8 sts=4 sw=4 noet:
+ *
+ * VIM - Vi IMproved	by Bram Moolenaar
+ *			Visual Workshop integration by Gordon Prieur
+ *
+ * Do ":help uganda"  in Vim to read copying and usage conditions.
+ * Do ":help credits" in Vim to see a list of people who contributed.
+ */
+
+#if !defined(BEVAL__H) && (defined(FEAT_BEVAL) || defined(PROTO))
+#define BEVAL__H
+
+#ifdef FEAT_GUI_GTK
+# ifdef USE_GTK3
+#  include <gtk/gtk.h>
+# else
+#  include <gtk/gtkwidget.h>
+# endif
+#else
+# if defined(FEAT_GUI_X11)
+#  include <X11/Intrinsic.h>
+# endif
+#endif
+
+typedef enum
+{
+    ShS_NEUTRAL,			/* nothing showing or pending */
+    ShS_PENDING,			/* data requested from debugger */
+    ShS_UPDATE_PENDING,			/* switching information displayed */
+    ShS_SHOWING				/* the balloon is being displayed */
+} BeState;
+
+typedef struct BalloonEvalStruct
+{
+#ifdef FEAT_GUI_GTK
+    GtkWidget		*target;	/* widget we are monitoring */
+    GtkWidget		*balloonShell;
+    GtkWidget		*balloonLabel;
+    unsigned int	timerID;	/* timer for run */
+    BeState		showState;	/* tells us whats currently going on */
+    int			x;
+    int			y;
+    unsigned int	state;		/* Button/Modifier key state */
+#else
+# if !defined(FEAT_GUI_W32)
+    Widget		target;		/* widget we are monitoring */
+    Widget		balloonShell;
+    Widget		balloonLabel;
+    XtIntervalId	timerID;	/* timer for run */
+    BeState		showState;	/* tells us whats currently going on */
+    XtAppContext	appContext;	/* used in event handler */
+    Position		x;
+    Position		y;
+    Position		x_root;
+    Position		y_root;
+    int			state;		/* Button/Modifier key state */
+# else
+    HWND		target;
+    HWND		balloon;
+    int			x;
+    int			y;
+    BeState		showState;	/* tells us whats currently going on */
+# endif
+#endif
+    int			ts;		/* tabstop setting for this buffer */
+    char_u		*msg;
+    void		(*msgCB)(struct BalloonEvalStruct *, int);
+    void		*clientData;	/* For callback */
+#if !defined(FEAT_GUI_GTK) && !defined(FEAT_GUI_W32)
+    Dimension		screen_width;	/* screen width in pixels */
+    Dimension		screen_height;	/* screen height in pixels */
+#endif
+} BalloonEval;
+
+#define EVAL_OFFSET_X 15 /* displacement of beval topleft corner from pointer */
+#define EVAL_OFFSET_Y 10
+
+#include "beval.pro"
+#ifdef FEAT_BEVAL_GUI
+# include "gui_beval.pro"
+#endif
+
+#endif /* BEVAL__H and FEAT_BEVAL_GUI */