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-rw-r--r--ext/kgio/kgio_ext.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/ext/kgio/kgio_ext.c b/ext/kgio/kgio_ext.c
index ac6f448..3b20064 100644
--- a/ext/kgio/kgio_ext.c
+++ b/ext/kgio/kgio_ext.c
@@ -15,6 +15,7 @@
 #include <assert.h>
 
 #include "missing/accept4.h"
+#include "missing/ancient_ruby.h"
 #include "nonblock.h"
 #include "my_fileno.h"
 #include "sock_for_fd.h"