https://git.ruby-lang.org/ruby.git/commit/?id=45bcab3c84

From 45bcab3c84c406dc4d0a1e34aa858aa925a71c97 Mon Sep 17 00:00:00 2001
From: Peter Zhu <peter@p...>
Date: Tue, 4 May 2021 21:31:29 +0000
Subject: Fix compilation error in mingw

__LITTLE_ENDIAN is not defined.
---
 siphash.c | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/siphash.c b/siphash.c
index 2c48fa8..0913767 100644
--- a/siphash.c
+++ b/siphash.c
@@ -5,11 +5,18 @@ https://github.com/ruby/ruby/blob/trunk/siphash.c#L5
   #define SIP_HASH_STREAMING 1
 #endif
 
-#ifdef _WIN32
+#if defined(__MINGW32__)
+  #include <sys/param.h>
+
+  /* MinGW only defines LITTLE_ENDIAN and BIG_ENDIAN macros */
+  #define __LITTLE_ENDIAN LITTLE_ENDIAN
+  #define __BIG_ENDIAN BIG_ENDIAN
+#elif defined(_WIN32)
   #define BYTE_ORDER __LITTLE_ENDIAN
-#elif !defined BYTE_ORDER
+#elif !defined(BYTE_ORDER)
   #include <endian.h>
 #endif
+
 #ifndef LITTLE_ENDIAN
 #define LITTLE_ENDIAN __LITTLE_ENDIAN
 #endif
-- 
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