headers: check that _GL_INLINE_HEADER_BEGIN is defined

[gnulib.git] / lib / count-one-bits.h

diff --git a/lib/count-one-bits.h b/lib/count-one-bits.h
index 3cb9eca..ce9d67e 100644 (file)
--- a/lib/count-one-bits.h
+++ b/lib/count-one-bits.h
@@ -22,6 +22,9 @@
 #include <stdlib.h>
 #include "verify.h"
 
+#ifndef _GL_INLINE_HEADER_BEGIN
+ #error "Please include config.h first."
+#endif
 _GL_INLINE_HEADER_BEGIN
 #ifndef COUNT_ONE_BITS_INLINE
 # define COUNT_ONE_BITS_INLINE _GL_INLINE