new file mode 100644
--- /dev/null
+++ b/src/proto/option.pro
@@ -0,0 +1,52 @@
+/* option.c */
+void set_init_1 __ARGS((void));
+void set_string_default __ARGS((char *name, char_u *val));
+void set_number_default __ARGS((char *name, long val));
+void set_init_2 __ARGS((void));
+void set_init_3 __ARGS((void));
+void set_helplang_default __ARGS((char_u *lang));
+void init_gui_options __ARGS((void));
+void set_title_defaults __ARGS((void));
+int do_set __ARGS((char_u *arg, int opt_flags));
+void set_options_bin __ARGS((int oldval, int newval, int opt_flags));
+int get_viminfo_parameter __ARGS((int type));
+char_u *find_viminfo_parameter __ARGS((int type));
+void check_options __ARGS((void));
+void check_buf_options __ARGS((buf_T *buf));
+void free_string_option __ARGS((char_u *p));
+void clear_string_option __ARGS((char_u **pp));
+void set_term_option_alloced __ARGS((char_u **p));
+void set_string_option_direct __ARGS((char_u *name, int opt_idx, char_u *val, int opt_flags));
+char_u *check_stl_option __ARGS((char_u *s));
+int get_option_value __ARGS((char_u *name, long *numval, char_u **stringval, int opt_flags));
+void set_option_value __ARGS((char_u *name, long number, char_u *string, int opt_flags));
+char_u *get_term_code __ARGS((char_u *tname));
+char_u *get_highlight_default __ARGS((void));
+int makeset __ARGS((FILE *fd, int opt_flags, int local_only));
+int makefoldset __ARGS((FILE *fd));
+void clear_termoptions __ARGS((void));
+void set_term_defaults __ARGS((void));
+void comp_col __ARGS((void));
+char_u *get_equalprg __ARGS((void));
+void win_copy_options __ARGS((win_T *wp_from, win_T *wp_to));
+void copy_winopt __ARGS((winopt_T *from, winopt_T *to));
+void check_win_options __ARGS((win_T *win));
+void check_winopt __ARGS((winopt_T *wop));
+void clear_winopt __ARGS((winopt_T *wop));
+void buf_copy_options __ARGS((buf_T *buf, int flags));
+void reset_modifiable __ARGS((void));
+void set_iminsert_global __ARGS((void));
+void set_imsearch_global __ARGS((void));
+void set_context_in_set_cmd __ARGS((expand_T *xp, char_u *arg, int opt_flags));
+int ExpandSettings __ARGS((expand_T *xp, regmatch_T *regmatch, int *num_file, char_u ***file));
+int ExpandOldSetting __ARGS((int *num_file, char_u ***file));
+int has_format_option __ARGS((int x));
+int shortmess __ARGS((int x));
+void vimrc_found __ARGS((void));
+void change_compatible __ARGS((int on));
+int option_was_set __ARGS((char_u *name));
+int can_bs __ARGS((int what));
+void save_file_ff __ARGS((buf_T *buf));
+int file_ff_differs __ARGS((buf_T *buf));
+int check_ff_value __ARGS((char_u *p));
+/* vim: set ft=c : */