add threadspawnl
diff --git a/include/thread.h b/include/thread.h
index 0ba726a..aa405af 100644
--- a/include/thread.h
+++ b/include/thread.h
@@ -171,6 +171,7 @@
 void		threadexec(Channel*, int[3], char*, char *[]);
 void		threadexecl(Channel*, int[3], char*, ...);
 int		threadspawn(int[3], char*, char*[]);
+int		threadspawnl(int[3], char*, ...);
 Channel*	threadwaitchan(void);
 
 #if defined(__cplusplus)