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-rw-r--r--include/ruby/io.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/ruby/io.h b/include/ruby/io.h
index 60029fedb6..e9dfeda5b1 100644
--- a/include/ruby/io.h
+++ b/include/ruby/io.h
@@ -138,6 +138,7 @@ struct rb_io_encoding {
};
#ifndef HAVE_RB_IO_T
+#define HAVE_RB_IO_T 1
/** Ruby's IO, metadata and buffers. */
struct rb_io {
/** The IO's Ruby level counterpart. */