-bool opts_setflag (const char *, bool);
-bool opts_setwarn (const char *, bool);
-bool opts_setoptim(const char *, bool);
+bool opts_setflag (const char *, bool);
+bool opts_setwarn (const char *, bool);
+bool opts_setwerror(const char *, bool);
+bool opts_setoptim (const char *, bool);