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-rw-r--r--ext/kgio/kgio.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/ext/kgio/kgio.h b/ext/kgio/kgio.h
index 1fdc36d..9056cef 100644
--- a/ext/kgio/kgio.h
+++ b/ext/kgio/kgio.h
@@ -43,5 +43,8 @@ void kgio_autopush_send(VALUE);
 
 VALUE kgio_call_wait_writable(VALUE io);
 VALUE kgio_call_wait_readable(VALUE io);
+#if defined(HAVE_RB_THREAD_BLOCKING_REGION) && defined(HAVE_POLL)
+#  define USE_KGIO_POLL
+#endif /* USE_KGIO_POLL */
 
 #endif /* KGIO_H */