1 files changed, 5 insertions, 3 deletions

diff --git a/lib/binary-io.h b/lib/binary-io.h
index 6f4db253354..855d6f819f0 100644
--- a/lib/binary-io.h
+++ b/lib/binary-io.h
@@ -17,6 +17,11 @@
 #ifndef _BINARY_H
 #define _BINARY_H
 
+/* This file uses _GL_INLINE_HEADER_BEGIN, _GL_INLINE, _GL_UNUSED.  */
+#if !_GL_CONFIG_H_INCLUDED
+ #error "Please include config.h first."
+#endif
+
 /* For systems that distinguish between text and binary I/O.
    O_BINARY is guaranteed by the gnulib <fcntl.h>. */
 #include <fcntl.h>
@@ -25,9 +30,6 @@
    so we include it here first.  */
 #include <stdio.h>
 
-#ifndef _GL_INLINE_HEADER_BEGIN
- #error "Please include config.h first."
-#endif
 _GL_INLINE_HEADER_BEGIN
 #ifndef BINARY_IO_INLINE
 # define BINARY_IO_INLINE _GL_INLINE