diff --git a/errmsg_int.h b/errmsg_int.h
new file mode 100644
index 0000000..a57a55d
--- /dev/null
+++ b/errmsg_int.h
@@ -0,0 +1,7 @@
+#include <stdarg.h>
+
+void errmsg_puts(int fd,const char* s);
+void errmsg_flush(int fd);
+void errmsg_start(int fd);
+
+void errmsg_write(int fd,const char* err,const char* message,va_list list);