From a0264c08a872ddb83230be49fc501ae14429797b Mon Sep 17 00:00:00 2001
From: Bruce Mitchener <bruce.mitchener@gmail.com>
Date: Mon, 3 Dec 2018 22:15:14 +0700
Subject: [PATCH] Windows builds need immintrin.h

Fixes issue #2006.
---
 src/util/mpz.cpp | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/util/mpz.cpp b/src/util/mpz.cpp
index 47c88560c..af95e1a2a 100644
--- a/src/util/mpz.cpp
+++ b/src/util/mpz.cpp
@@ -45,6 +45,11 @@ Revision History:
 #define LEHMER_GCD
 #endif
 
+#ifdef _WINDOWS
+// This is needed for _tzcnt_u32 and friends.
+#include <immintrin.h>
+#endif
+
 #if defined(__GNUC__)
 #define _trailing_zeros32(X) __builtin_ctz(X)
 #else