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-rw-r--r--ext/dbm/dbm.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/ext/dbm/dbm.c b/ext/dbm/dbm.c
index c4a47e8004..f873781d28 100644
--- a/ext/dbm/dbm.c
+++ b/ext/dbm/dbm.c
@@ -12,6 +12,9 @@
#include "ruby.h"
+#ifdef HAVE_CDEFS_H
+# include <cdefs.h>
+#endif
#include <ndbm.h>
#include <fcntl.h>
#include <errno.h>