Add optional, variadic arguments
diff --git a/src/lisp/lib/std.h b/src/lisp/lib/std.h
index a117b5d..dae0ac3 100644
--- a/src/lisp/lib/std.h
+++ b/src/lisp/lib/std.h
@@ -6,6 +6,7 @@
value_t l_plus(value_t a, value_t b);
value_t l_printval(value_t val);
-void add_function(struct environment *env, char *name, void *func, int nargs, enum namespace ns);
+void add_function(struct environment *env, char *name, void *func, struct args *args, enum namespace ns);
+void add_c_function(struct environment *env, char *name, void *func, int nargs);
void load_std(struct environment *env);
bool load_library(struct environment *env, char *name);