https://git.ruby-lang.org/ruby.git/commit/?id=1370b0876f

From 1370b0876f4d67e20e8f50f3c048447befd71fdc Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E5=8D=9C=E9=83=A8=E6=98=8C=E5=B9=B3?=
 <shyouhei@r...>
Date: Thu, 11 Nov 2021 09:49:55 +0900
Subject: io/buffer.h: C linkage

Because `make install` installs this header to target systems, it must
be ready to be `#include`d form a C++ program.
---
 include/ruby/io/buffer.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/include/ruby/io/buffer.h b/include/ruby/io/buffer.h
index c6132c572a6..9c0eaefcc53 100644
--- a/include/ruby/io/buffer.h
+++ b/include/ruby/io/buffer.h
@@ -16,7 +16,7 @@ https://github.com/ruby/ruby/blob/trunk/include/ruby/io/buffer.h#L16
 #include "ruby/ruby.h"
 #include "ruby/internal/config.h"
 
-RUBY_SYMBOL_EXPORT_BEGIN
+RBIMPL_SYMBOL_EXPORT_BEGIN()
 
 // WARNING: This entire interface is experimental and may change in the future!
 #define RB_IO_BUFFER_EXPERIMENTAL 1
@@ -73,6 +73,6 @@ size_t rb_io_buffer_copy(VALUE self, VALUE source, size_t offset); https://github.com/ruby/ruby/blob/trunk/include/ruby/io/buffer.h#L73
 void rb_io_buffer_resize(VALUE self, size_t size, size_t preserve);
 void rb_io_buffer_clear(VALUE self, uint8_t value, size_t offset, size_t length);
 
-RUBY_SYMBOL_EXPORT_END
+RBIMPL_SYMBOL_EXPORT_END()
 
 #endif  /* RUBY_IO_BUFFER_T */
-- 
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