diff --git a/src/Makefile b/src/Makefile
index 38d31eb..f388f9a 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -1661,6 +1661,7 @@
 	hangulin.pro \
 	if_cscope.pro \
 	if_lua.pro \
+	if_mzsch.pro \
 	if_python.pro \
 	if_python3.pro \
 	if_ruby.pro \
@@ -1668,6 +1669,7 @@
 	json.pro \
 	main.pro \
 	mark.pro \
+	mbyte.pro \
 	memfile.pro \
 	memline.pro \
 	menu.pro \
@@ -1675,7 +1677,6 @@
 	misc1.pro \
 	misc2.pro \
 	move.pro \
-	mbyte.pro \
 	normal.pro \
 	ops.pro \
 	option.pro \
diff --git a/src/if_mzsch.c b/src/if_mzsch.c
index 9038195..4f08577 100644
--- a/src/if_mzsch.c
+++ b/src/if_mzsch.c
@@ -29,6 +29,19 @@
  * depend". */
 #if defined(FEAT_MZSCHEME) || defined(PROTO)
 
+#ifdef PROTO
+typedef int Scheme_Object;
+typedef int Scheme_Closed_Prim;
+typedef int Scheme_Env;
+typedef int Scheme_Hash_Table;
+typedef int Scheme_Type;
+typedef int Scheme_Thread;
+typedef int Scheme_Closed_Prim;
+typedef int mzshort;
+typedef int Scheme_Prim;
+typedef int HINSTANCE;
+#endif
+
 /*
  * scheme_register_tls_space is only available on 32-bit Windows until
  * racket-6.3.  See
@@ -248,7 +261,7 @@
 # define BUFFER_REF(buf) (vim_mz_buffer *)((buf)->b_mzscheme_ref)
 #endif
 
-#ifdef DYNAMIC_MZSCHEME
+#if defined(DYNAMIC_MZSCHEME) || defined(PROTO)
 static Scheme_Object *dll_scheme_eof;
 static Scheme_Object *dll_scheme_false;
 static Scheme_Object *dll_scheme_void;
@@ -406,6 +419,8 @@
 static void (*dll_scheme_set_config_path)(Scheme_Object *p);
 # endif
 
+#if defined(DYNAMIC_MZSCHEME) /* not when defined(PROTO) */
+
 /* arrays are imported directly */
 # define scheme_eof dll_scheme_eof
 # define scheme_false dll_scheme_false
@@ -539,6 +554,8 @@
 #  endif
 # endif
 
+#endif
+
 typedef struct
 {
     char    *name;
@@ -866,7 +883,7 @@
 }
 #endif
 
-#ifdef MZSCHEME_GUI_THREADS
+#if defined(MZSCHEME_GUI_THREADS) || defined(PROTO)
 static void setup_timer(void);
 static void remove_timer(void);
 
diff --git a/src/proto/gui_gtk_gresources.pro b/src/proto/gui_gtk_gresources.pro
index 6758047..c09c793 100644
--- a/src/proto/gui_gtk_gresources.pro
+++ b/src/proto/gui_gtk_gresources.pro
@@ -1,5 +1,5 @@
 /* auto/gui_gtk_gresources.c */
-GResource *gui_gtk_get_resource __ARGS((void));
-void gui_gtk_register_resource __ARGS((void));
-void gui_gtk_unregister_resource __ARGS((void));
+GResource *gui_gtk_get_resource(void);
+void gui_gtk_unregister_resource(void);
+void gui_gtk_register_resource(void);
 /* vim: set ft=c : */
diff --git a/src/proto/gui_mac.pro b/src/proto/gui_mac.pro
index 2010f97..9e7f54f 100644
--- a/src/proto/gui_mac.pro
+++ b/src/proto/gui_mac.pro
@@ -4,114 +4,114 @@
  * Mac specific prototypes
  */
 
-pascal Boolean WaitNextEventWrp __ARGS((EventMask eventMask, EventRecord *theEvent, UInt32 sleep, RgnHandle mouseRgn));
-pascal void gui_mac_scroll_action __ARGS((ControlHandle theControl, short partCode));
+pascal Boolean WaitNextEventWrp(EventMask eventMask, EventRecord *theEvent, UInt32 sleep, RgnHandle mouseRgn);
+pascal void gui_mac_scroll_action(ControlHandle theControl, short partCode);
 pascal void gui_mac_drag_thumb (ControlHandle theControl, short partCode);
-void gui_mac_handle_event __ARGS((EventRecord *event));
-void gui_mac_doMouseDown __ARGS((EventRecord *theEvent));
-void gui_mac_do_key __ARGS((EventRecord *theEvent));
-void gui_mac_handle_menu __ARGS((long menuChoice));
-void gui_mac_focus_change __ARGS((EventRecord *event));
-void gui_mac_update __ARGS((EventRecord *event));
-short gui_mch_get_mac_menu_item_index __ARGS((vimmenu_T *menu, vimmenu_T *parent));
-void gui_mch_set_blinking __ARGS((long wait, long on, long off));
-void gui_mch_stop_blink __ARGS((void));
-void gui_mch_start_blink __ARGS((void));
-void gui_mch_getmouse __ARGS((int *x, int *y));
-void gui_mch_setmouse __ARGS((int x, int y));
-void gui_mch_prepare __ARGS((int *argc, char **argv));
-int gui_mch_init_check __ARGS((void));
-int gui_mch_init __ARGS((void));
-void gui_mch_new_colors __ARGS((void));
-int gui_mch_open __ARGS((void));
-void gui_mch_exit __ARGS((int));
-void gui_mch_set_winsize __ARGS((int width, int height, int min_width, int min_height, int base_width, int base_height));
-int gui_mch_get_winpos __ARGS((int *x, int *y));
-void gui_mch_set_winpos __ARGS((int x, int y));
-void gui_mch_set_shellsize __ARGS((int width, int height, int min_width, int min_height, int base_width, int base_height, int direction));
-void gui_mch_get_screen_dimensions __ARGS((int *screen_w, int *screen_h));
-void gui_mch_set_text_area_pos __ARGS((int x, int y, int w, int h));
-void gui_mch_enable_scrollbar __ARGS((scrollbar_T *sb, int flag));
-void gui_mch_set_scrollbar_thumb __ARGS((scrollbar_T *sb, long val, long size, long max));
-void gui_mch_set_scrollbar_pos __ARGS((scrollbar_T *sb, int x, int y, int w, int h));
-void gui_mch_create_scrollbar __ARGS((scrollbar_T *sb, int orient));
-void gui_mch_destroy_scrollbar __ARGS((scrollbar_T *sb));
-int gui_mch_adjust_charheight __ARGS((void));
-int gui_mch_init_font __ARGS((char_u *font_name, int fontset));
-GuiFont gui_mch_get_font __ARGS((char_u *name, int giveErrorIfMissing));
-char_u *gui_mch_get_fontname __ARGS((GuiFont font, char_u *name));
-GuiFont gui_mac_find_font __ARGS((char_u *font_name));
-void gui_mch_set_font __ARGS((GuiFont font));
-int gui_mch_same_font __ARGS((GuiFont f1, GuiFont f2));
-void gui_mch_free_font __ARGS((GuiFont font));
-guicolor_T gui_mch_get_color __ARGS((char_u *name));
-void gui_mch_set_fg_color __ARGS((guicolor_T color));
-void gui_mch_set_bg_color __ARGS((guicolor_T color));
-void gui_mch_set_sp_color __ARGS((guicolor_T color));
-void gui_mch_draw_string __ARGS((int row, int col, char_u *s, int len, int flags));
-int gui_mch_haskey __ARGS((char_u *name));
-void gui_mch_beep __ARGS((void));
-void gui_mch_flash __ARGS((int msec));
-void gui_mch_invert_rectangle __ARGS((int r, int c, int nr, int nc));
-void gui_mch_iconify __ARGS((void));
-void gui_mch_settitle __ARGS((char_u *title, char_u *icon));
-void gui_mch_draw_hollow_cursor __ARGS((guicolor_T color));
-void gui_mch_draw_part_cursor __ARGS((int w, int h, guicolor_T color));
-void gui_mch_update __ARGS((void));
-int gui_mch_wait_for_chars __ARGS((int wtime));
-void gui_mch_flush __ARGS((void));
-void gui_mch_clear_block __ARGS((int row1, int col1, int row2, int col2));
-void gui_mch_clear_all __ARGS((void));
-void gui_mch_delete_lines __ARGS((int row, int num_lines));
-void gui_mch_insert_lines __ARGS((int row, int num_lines));
-void gui_mch_enable_menu __ARGS((int flag));
-void gui_mch_set_menu_pos __ARGS((int x, int y, int w, int h));
-/*void gui_mch_add_menu __ARGS((vimmenu_T *menu, vimmenu_T *parent, int idx));*/
-void gui_mch_add_menu __ARGS((vimmenu_T *menu, int pos));
-/*void gui_mch_add_menu_item __ARGS((vimmenu_T *menu, vimmenu_T *parent, int idx));*/
-void gui_mch_add_menu_item __ARGS((vimmenu_T *menu, int idx));
-void gui_mch_show_popupmenu __ARGS((vimmenu_T *menu));
-void gui_mch_destroy_menu __ARGS((vimmenu_T *menu));
-void gui_mch_menu_grey __ARGS((vimmenu_T *menu, int grey));
-void gui_mch_menu_hidden __ARGS((vimmenu_T *menu, int hidden));
-void gui_mch_draw_menubar __ARGS((void));
-int gui_mch_get_lightness __ARGS((guicolor_T pixel));
-long_u gui_mch_get_rgb __ARGS((guicolor_T pixel));
-int gui_mch_get_mouse_x __ARGS((void));
-int gui_mch_get_mouse_y __ARGS((void));
-void gui_mch_setmouse __ARGS((int x, int y));
-void gui_mch_show_popupmenu __ARGS((vimmenu_T *menu));
-int gui_mch_dialog __ARGS((int type, char_u *title, char_u *message, char_u *buttons, int dfltbutton, char_u *textfield, int ex_cmd));
-char_u *gui_mch_browse __ARGS((int saving, char_u *title, char_u *dflt, char_u *ext, char_u *initdir, char_u *filter));
-void gui_mch_set_foreground __ARGS((void));
-void gui_mch_show_tabline __ARGS((int showit));
-int gui_mch_showing_tabline __ARGS((void));
-void gui_mch_update_tabline __ARGS((void));
-void gui_mch_set_curtab __ARGS((int nr));
+void gui_mac_handle_event(EventRecord *event);
+void gui_mac_doMouseDown(EventRecord *theEvent);
+void gui_mac_do_key(EventRecord *theEvent);
+void gui_mac_handle_menu(long menuChoice);
+void gui_mac_focus_change(EventRecord *event);
+void gui_mac_update(EventRecord *event);
+short gui_mch_get_mac_menu_item_index(vimmenu_T *menu, vimmenu_T *parent);
+void gui_mch_set_blinking(long wait, long on, long off);
+void gui_mch_stop_blink(void);
+void gui_mch_start_blink(void);
+void gui_mch_getmouse(int *x, int *y);
+void gui_mch_setmouse(int x, int y);
+void gui_mch_prepare(int *argc, char **argv);
+int gui_mch_init_check(void);
+int gui_mch_init(void);
+void gui_mch_new_colors(void);
+int gui_mch_open(void);
+void gui_mch_exit(int);
+void gui_mch_set_winsize(int width, int height, int min_width, int min_height, int base_width, int base_height);
+int gui_mch_get_winpos(int *x, int *y);
+void gui_mch_set_winpos(int x, int y);
+void gui_mch_set_shellsize(int width, int height, int min_width, int min_height, int base_width, int base_height, int direction);
+void gui_mch_get_screen_dimensions(int *screen_w, int *screen_h);
+void gui_mch_set_text_area_pos(int x, int y, int w, int h);
+void gui_mch_enable_scrollbar(scrollbar_T *sb, int flag);
+void gui_mch_set_scrollbar_thumb(scrollbar_T *sb, long val, long size, long max);
+void gui_mch_set_scrollbar_pos(scrollbar_T *sb, int x, int y, int w, int h);
+void gui_mch_create_scrollbar(scrollbar_T *sb, int orient);
+void gui_mch_destroy_scrollbar(scrollbar_T *sb);
+int gui_mch_adjust_charheight(void);
+int gui_mch_init_font(char_u *font_name, int fontset);
+GuiFont gui_mch_get_font(char_u *name, int giveErrorIfMissing);
+char_u *gui_mch_get_fontname(GuiFont font, char_u *name);
+GuiFont gui_mac_find_font(char_u *font_name);
+void gui_mch_set_font(GuiFont font);
+int gui_mch_same_font(GuiFont f1, GuiFont f2);
+void gui_mch_free_font(GuiFont font);
+guicolor_T gui_mch_get_color(char_u *name);
+void gui_mch_set_fg_color(guicolor_T color);
+void gui_mch_set_bg_color(guicolor_T color);
+void gui_mch_set_sp_color(guicolor_T color);
+void gui_mch_draw_string(int row, int col, char_u *s, int len, int flags);
+int gui_mch_haskey(char_u *name);
+void gui_mch_beep(void);
+void gui_mch_flash(int msec);
+void gui_mch_invert_rectangle(int r, int c, int nr, int nc);
+void gui_mch_iconify(void);
+void gui_mch_settitle(char_u *title, char_u *icon);
+void gui_mch_draw_hollow_cursor(guicolor_T color);
+void gui_mch_draw_part_cursor(int w, int h, guicolor_T color);
+void gui_mch_update(void);
+int gui_mch_wait_for_chars(int wtime);
+void gui_mch_flush(void);
+void gui_mch_clear_block(int row1, int col1, int row2, int col2);
+void gui_mch_clear_all(void);
+void gui_mch_delete_lines(int row, int num_lines);
+void gui_mch_insert_lines(int row, int num_lines);
+void gui_mch_enable_menu(int flag);
+void gui_mch_set_menu_pos(int x, int y, int w, int h);
+/*void gui_mch_add_menu(vimmenu_T *menu, vimmenu_T *parent, int idx);*/
+void gui_mch_add_menu(vimmenu_T *menu, int pos);
+/*void gui_mch_add_menu_item(vimmenu_T *menu, vimmenu_T *parent, int idx);*/
+void gui_mch_add_menu_item(vimmenu_T *menu, int idx);
+void gui_mch_show_popupmenu(vimmenu_T *menu);
+void gui_mch_destroy_menu(vimmenu_T *menu);
+void gui_mch_menu_grey(vimmenu_T *menu, int grey);
+void gui_mch_menu_hidden(vimmenu_T *menu, int hidden);
+void gui_mch_draw_menubar(void);
+int gui_mch_get_lightness(guicolor_T pixel);
+long_u gui_mch_get_rgb(guicolor_T pixel);
+int gui_mch_get_mouse_x(void);
+int gui_mch_get_mouse_y(void);
+void gui_mch_setmouse(int x, int y);
+void gui_mch_show_popupmenu(vimmenu_T *menu);
+int gui_mch_dialog(int type, char_u *title, char_u *message, char_u *buttons, int dfltbutton, char_u *textfield, int ex_cmd);
+char_u *gui_mch_browse(int saving, char_u *title, char_u *dflt, char_u *ext, char_u *initdir, char_u *filter);
+void gui_mch_set_foreground(void);
+void gui_mch_show_tabline(int showit);
+int gui_mch_showing_tabline(void);
+void gui_mch_update_tabline(void);
+void gui_mch_set_curtab(int nr);
 
-char_u *C2Pascal_save __ARGS((char_u *Cstring));
-char_u *C2Pascal_save_and_remove_backslash __ARGS((char_u *Cstring));
-int_u EventModifiers2VimMouseModifiers __ARGS((EventModifiers macModifiers));
-char_u **new_fnames_from_AEDesc __ARGS((AEDesc *theList, long *numFiles, OSErr *error));
+char_u *C2Pascal_save(char_u *Cstring);
+char_u *C2Pascal_save_and_remove_backslash(char_u *Cstring);
+int_u EventModifiers2VimMouseModifiers(EventModifiers macModifiers);
+char_u **new_fnames_from_AEDesc(AEDesc *theList, long *numFiles, OSErr *error);
 
 
-void gui_request_selection __ARGS((void));
-void gui_mch_lose_selection __ARGS((void));
-int gui_mch_own_selection __ARGS((void));
-void gui_mch_clear_selection __ARGS((void));
+void gui_request_selection(void);
+void gui_mch_lose_selection(void);
+int gui_mch_own_selection(void);
+void gui_mch_clear_selection(void);
 
-void gui_win_new_height __ARGS((win_T *wp));
-void gui_win_comp_pos __ARGS((void));
-void gui_win_free __ARGS((win_T *wp));
-void gui_win_alloc __ARGS((win_T *wp));
+void gui_win_new_height(win_T *wp);
+void gui_win_comp_pos(void);
+void gui_win_free(win_T *wp);
+void gui_win_alloc(win_T *wp);
 void mch_post_buffer_write (buf_T *buf);
 
-void mch_errmsg __ARGS((char *str));
-void mch_display_error __ARGS((void));
-void clip_mch_lose_selection __ARGS((VimClipboard *cbd));
-void clip_mch_request_selection __ARGS((VimClipboard *cbd));
-void clip_mch_set_selection __ARGS((VimClipboard *cbd));
-int clip_mch_own_selection __ARGS((VimClipboard *cbd));
+void mch_errmsg(char *str);
+void mch_display_error(void);
+void clip_mch_lose_selection(VimClipboard *cbd);
+void clip_mch_request_selection(VimClipboard *cbd);
+void clip_mch_set_selection(VimClipboard *cbd);
+int clip_mch_own_selection(VimClipboard *cbd);
 
 pascal	OSErr	FindProcessBySignature( const OSType targetType,
 					const OSType targetCreator, ProcessSerialNumberPtr psnPtr );
@@ -129,17 +129,17 @@
 pascal OSErr Handle_KAHL_GTTX_AE (const AppleEvent *theAEvent, AppleEvent *theReply, long refCon);
 void Send_KAHL_MOD_AE (buf_T *buf);
 
-void gui_mac_doInContentClick __ARGS((EventRecord *theEvent, WindowPtr	 whichWindow));
-void gui_mac_doInDragClick __ARGS((Point where, WindowPtr whichWindow));
-void gui_mac_doInGrowClick __ARGS((Point where, WindowPtr whichWindow));
-void gui_mac_doUpdateEvent __ARGS((EventRecord *event));
-void gui_mac_doActivateEvent __ARGS((EventRecord *event));
-void gui_mac_doSuspendEvent __ARGS((EventRecord *event));
-void gui_mac_doKeyEvent __ARGS((EventRecord *theEvent));
-void gui_mac_doMouseDownEvent __ARGS((EventRecord *theEvent));
-void gui_mac_doMouseMovedEvent __ARGS((EventRecord *event));
-void gui_mac_doMouseUpEvent __ARGS((EventRecord *theEvent));
-void gui_mch_mousehide __ARGS((int hide));
+void gui_mac_doInContentClick(EventRecord *theEvent, WindowPtr	 whichWindow);
+void gui_mac_doInDragClick(Point where, WindowPtr whichWindow);
+void gui_mac_doInGrowClick(Point where, WindowPtr whichWindow);
+void gui_mac_doUpdateEvent(EventRecord *event);
+void gui_mac_doActivateEvent(EventRecord *event);
+void gui_mac_doSuspendEvent(EventRecord *event);
+void gui_mac_doKeyEvent(EventRecord *theEvent);
+void gui_mac_doMouseDownEvent(EventRecord *theEvent);
+void gui_mac_doMouseMovedEvent(EventRecord *event);
+void gui_mac_doMouseUpEvent(EventRecord *theEvent);
+void gui_mch_mousehide(int hide);
 
 int C2PascalString (char_u *CString, Str255 *PascalString);
 int GetFSSpecFromPath ( char_u *file, FSSpec *fileFSSpec);
diff --git a/src/proto/if_mzsch.pro b/src/proto/if_mzsch.pro
index d1180bf..193bd49 100644
--- a/src/proto/if_mzsch.pro
+++ b/src/proto/if_mzsch.pro
@@ -1,20 +1,17 @@
 /* if_mzsch.c */
-int mzscheme_enabled __ARGS((int verbose));
-void mzscheme_end __ARGS((void));
-void ex_mzscheme __ARGS((exarg_T *eap));
-void ex_mzfile __ARGS((exarg_T *eap));
-void mzscheme_buffer_free __ARGS((buf_T *buf));
-void mzscheme_window_free __ARGS((win_T *win));
-char *mzscheme_version __ARGS((void));
+int mzscheme_enabled(int verbose);
+void mzvim_check_threads(void);
+void mzvim_reset_timer(void);
+void mzscheme_end(void);
+int mzscheme_main(int argc, char **argv);
+void mzscheme_buffer_free(buf_T *buf);
+void mzscheme_window_free(win_T *win);
+void ex_mzscheme(exarg_T *eap);
+void ex_mzfile(exarg_T *eap);
+void do_mzeval(char_u *str, typval_T *rettv);
 void raise_vim_exn(const char *add_info);
-void raise_if_error __ARGS((void));
-buf_T *get_valid_buffer __ARGS((void *));
-win_T *get_valid_window __ARGS((void *));
-void mzvim_check_threads __ARGS((void));
-void mzvim_reset_timer __ARGS((void));
-void *mzvim_eval_string __ARGS((char_u *str));
-int mzthreads_allowed __ARGS((void));
-int mzscheme_main __ARGS((int argc, char **argv));
-void do_mzeval __ARGS((char_u *str, typval_T *rettv));
-int vim_main2 __ARGS((int argc, char **argv));
+void raise_if_error(void);
+buf_T *get_valid_buffer(void *obj);
+win_T *get_valid_window(void *obj);
+int mzthreads_allowed(void);
 /* vim: set ft=c : */
diff --git a/src/proto/if_ole.pro b/src/proto/if_ole.pro
index 36edcb0..adedf6a 100644
--- a/src/proto/if_ole.pro
+++ b/src/proto/if_ole.pro
@@ -1,5 +1,5 @@
 /* if_ole.cpp */
-void InitOLE __ARGS((int* pbDoRestart));
-void UninitOLE __ARGS((void));
-void RegisterMe __ARGS((int silent));
-void UnregisterMe __ARGS((int bNotifyUser));
+void InitOLE(int* pbDoRestart);
+void UninitOLE(void);
+void RegisterMe(int silent);
+void UnregisterMe(int bNotifyUser);
diff --git a/src/proto/os_qnx.pro b/src/proto/os_qnx.pro
index 54a6314..89a250f 100644
--- a/src/proto/os_qnx.pro
+++ b/src/proto/os_qnx.pro
@@ -1,8 +1,8 @@
 /* os_qnx.c */
-void qnx_init __ARGS((void));
-void qnx_clip_init __ARGS((void));
-int clip_mch_own_selection __ARGS((VimClipboard *cbd));
-void clip_mch_lose_selection __ARGS((VimClipboard *cbd));
-void clip_mch_request_selection __ARGS((VimClipboard *cbd));
-void clip_mch_set_selection __ARGS((VimClipboard *cbd));
+void qnx_init(void);
+void qnx_clip_init (void);
+int clip_mch_own_selection(VimClipboard *cbd);
+void clip_mch_lose_selection(VimClipboard *cbd);
+void clip_mch_request_selection(VimClipboard *cbd);
+void clip_mch_set_selection(VimClipboard *cbd);
 /* vim: set ft=c : */
diff --git a/src/version.c b/src/version.c
index cd61434..7553015 100644
--- a/src/version.c
+++ b/src/version.c
@@ -747,6 +747,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1203,
+/**/
     1202,
 /**/
     1201,
diff --git a/src/vim.h b/src/vim.h
index 7fea749..1cab32d 100644
--- a/src/vim.h
+++ b/src/vim.h
@@ -2319,4 +2319,9 @@
 # define MAX_OPEN_CHANNELS 0
 #endif
 
+#ifdef FEAT_MZSCHEME
+/* this is in main.c, cproto can't handle it. */
+int vim_main2(int argc, char **argv);
+#endif
+
 #endif /* VIM__H */