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-rw-r--r--lib/glthread/lock.h8
1 files changed, 8 insertions, 0 deletions
diff --git a/lib/glthread/lock.h b/lib/glthread/lock.h
index ae3ee2d671..805cd1cf61 100644
--- a/lib/glthread/lock.h
+++ b/lib/glthread/lock.h
@@ -77,6 +77,14 @@
#ifndef _LOCK_H
#define _LOCK_H
+/* This file uses HAVE_THREADS_H, HAVE_PTHREAD_RWLOCK,
+ HAVE_PTHREAD_RWLOCK_RDLOCK_PREFER_WRITER,
+ PTHREAD_RWLOCK_WRITER_NONRECURSIVE_INITIALIZER_NP,
+ HAVE_PTHREAD_MUTEX_RECURSIVE. */
+#if !_GL_CONFIG_H_INCLUDED
+ #error "Please include config.h first."
+#endif
+
#include <errno.h>
#include <stdlib.h>