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-rw-r--r--lib/pipe-filter-aux.h4
1 files changed, 3 insertions, 1 deletions
diff --git a/lib/pipe-filter-aux.h b/lib/pipe-filter-aux.h
index 6294d0df85..4d60ddace9 100644
--- a/lib/pipe-filter-aux.h
+++ b/lib/pipe-filter-aux.h
@@ -15,9 +15,11 @@
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>. */
-#ifndef _GL_INLINE_HEADER_BEGIN
+/* This file uses _GL_INLINE_HEADER_BEGIN, _GL_INLINE. */
+#if !_GL_CONFIG_H_INCLUDED
#error "Please include config.h first."
#endif
+
_GL_INLINE_HEADER_BEGIN
#ifndef PIPE_FILTER_AUX_INLINE
# define PIPE_FILTER_AUX_INLINE _GL_INLINE