diff '--color=auto' -urN a/argp/gllib/argp.h b/argp/gllib/argp.h
--- a/argp/gllib/argp.h	2023-07-06 19:01:41.098985400 -0400
+++ b/argp/gllib/argp.h	2023-07-08 08:51:57.641653900 -0400
@@ -19,6 +19,8 @@
 #ifndef _ARGP_H
 #define _ARGP_H
 
+#include <argp-config.h>
+
 /* This file uses _GL_INLINE_HEADER_BEGIN, _GL_INLINE, _GL_ATTRIBUTE_FORMAT.  */
 #if !_LIBC && !_GL_CONFIG_H_INCLUDED
  #error "Please include config.h first."
