From 4c0196c3ef3f254a22030eda787105c8a48df919 Mon Sep 17 00:00:00 2001
From: Yuri Victorovich <yuri@FreeBSD.org>
Date: Fri, 24 Jun 2022 12:15:58 -0700
Subject: [PATCH] Add missing header for std::swap

---
 libhelfem/src/erfc_expn.cpp | 1 +
 1 file changed, 1 insertion(+)

diff --git a/libhelfem/src/erfc_expn.cpp b/libhelfem/src/erfc_expn.cpp
index 641e42f..0730d48 100644
--- a/libhelfem/src/erfc_expn.cpp
+++ b/libhelfem/src/erfc_expn.cpp
@@ -15,6 +15,7 @@
  */
 
 #include "erfc_expn.h"
+#include <algorithm>
 #include <cmath>
 #include <cfloat>
 #include <stdexcept>