headers: check that _GL_INLINE_HEADER_BEGIN is defined

[gnulib.git] / lib / sys_socket.in.h

diff --git a/lib/sys_socket.in.h b/lib/sys_socket.in.h
index 932fc22..8f64363 100644 (file)
--- a/lib/sys_socket.in.h
+++ b/lib/sys_socket.in.h
@@ -63,6 +63,9 @@
 #ifndef _@GUARD_PREFIX@_SYS_SOCKET_H
 #define _@GUARD_PREFIX@_SYS_SOCKET_H
 
+#ifndef _GL_INLINE_HEADER_BEGIN
+ #error "Please include config.h first."
+#endif
 _GL_INLINE_HEADER_BEGIN
 #ifndef _GL_SYS_SOCKET_INLINE
 # define _GL_SYS_SOCKET_INLINE _GL_INLINE