diff --git a/src/proto/os_riscos.pro b/src/proto/os_riscos.pro
new file mode 100644
index 0000000..9ea4cd5
--- /dev/null
+++ b/src/proto/os_riscos.pro
@@ -0,0 +1,49 @@
+/* os_riscos.c */
+void mch_write __ARGS((char_u *s, int len));
+int mch_inchar __ARGS((char_u *buf, int maxlen, long wtime, int tb_change_cnt));
+int mch_char_avail __ARGS((void));
+long_u mch_avail_mem __ARGS((int special));
+void mch_delay __ARGS((long msec, int ignoreinput));
+void mch_suspend __ARGS((void));
+void mch_init __ARGS((void));
+int mch_check_win __ARGS((int argc, char **argv));
+int mch_input_isatty __ARGS((void));
+int mch_can_restore_title __ARGS((void));
+int mch_can_restore_icon __ARGS((void));
+void mch_settitle __ARGS((char_u *title, char_u *icon));
+void mch_restore_title __ARGS((int which));
+int mch_get_user_name __ARGS((char_u *s, int len));
+void mch_get_host_name __ARGS((char_u *s, int len));
+long mch_get_pid __ARGS((void));
+int mch_dirname __ARGS((char_u *buf, int len));
+int mch_FullName __ARGS((char_u *fname, char_u *buf, int len, int force));
+int mch_isFullName __ARGS((char_u *fname));
+long mch_getperm __ARGS((char_u *name));
+int mch_setperm __ARGS((char_u *name, long perm));
+void mch_hide __ARGS((char_u *name));
+int mch_isdir __ARGS((char_u *name));
+int mch_can_exe __ARGS((char_u *name));
+int mch_nodetype __ARGS((char_u *name));
+void mch_early_init __ARGS((void));
+void mch_exit __ARGS((int r));
+void mch_settmode __ARGS((int tmode));
+void mch_setmouse __ARGS((int on));
+int mch_screenmode __ARGS((char_u *arg));
+int mch_get_shellsize __ARGS((void));
+void mch_set_shellsize __ARGS((void));
+void mch_new_shellsize __ARGS((void));
+int mch_call_shell __ARGS((char_u *cmd, int options));
+void mch_breakcheck __ARGS((void));
+int mch_expandpath __ARGS((garray_T *gap, char_u *path, int flags));
+int expand_section __ARGS((garray_T *gap, char_u *root, char_u *rest, int flags));
+int mch_expand_wildcards __ARGS((int num_pat, char_u **pat, int *num_file, char_u ***file, int flags));
+int mch_has_exp_wildcard __ARGS((char_u *p));
+int mch_has_wildcard __ARGS((char_u *p));
+int mch_remove __ARGS((char_u *file));
+char_u *mch_munge_fname __ARGS((char_u *fname));
+int ro_buflist_add __ARGS((char_u *old_name));
+int mch_chdir __ARGS((char_u *dir));
+void mch_read_filetype __ARGS((char_u *file));
+void mch_set_filetype __ARGS((char_u *file, char_u *type));
+int mch_check_filetype __ARGS((char_u *fname, char_u *type));
+/* vim: set ft=c : */