https://git.ruby-lang.org/ruby.git/commit/?id=29f6f79e73

From 29f6f79e7396018962eb25c5f5e409f5fe28a73b Mon Sep 17 00:00:00 2001
From: xtkoba <69125751+xtkoba@u...>
Date: Thu, 29 Apr 2021 23:26:16 +0900
Subject: Get `ruby_nonempty_memcpy` to have C linkage

Fixes [Bug #17788]
---
 include/ruby/internal/memory.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/include/ruby/internal/memory.h b/include/ruby/internal/memory.h
index 7d24df4..1f95387 100644
--- a/include/ruby/internal/memory.h
+++ b/include/ruby/internal/memory.h
@@ -256,6 +256,7 @@ rb_alloc_tmp_buffer2(volatile VALUE *store, long count, size_t elsize) https://github.com/ruby/ruby/blob/trunk/include/ruby/internal/memory.h#L256
 }
 
 #ifndef __MINGW32__
+RBIMPL_SYMBOL_EXPORT_BEGIN()
 RBIMPL_ATTR_NOALIAS()
 RBIMPL_ATTR_NONNULL((1))
 RBIMPL_ATTR_RETURNS_NONNULL()
@@ -272,6 +273,7 @@ ruby_nonempty_memcpy(void *dest, const void *src, size_t n) https://github.com/ruby/ruby/blob/trunk/include/ruby/internal/memory.h#L273
         return dest;
     }
 }
+RBIMPL_SYMBOL_EXPORT_END()
 #undef memcpy
 #define memcpy ruby_nonempty_memcpy
 #endif
-- 
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