From 799ee0e3e8b3973c2d30fd0f30c6990bc9114aeb Mon Sep 17 00:00:00 2001
From: Martijn Courteaux <courteauxmartijn@gmail.com>
Date: Sat, 11 Feb 2023 05:47:48 +0100
Subject: [PATCH] Add <locale> to be spec-compliant for std::isalnum (didn't
 work on MSVC). (#385)

---
 include/cxxopts.hpp | 1 +
 1 file changed, 1 insertion(+)

diff --git a/include/cxxopts.hpp b/include/cxxopts.hpp
index abfd80d..e39ca51 100644
--- a/include/cxxopts.hpp
+++ b/include/cxxopts.hpp
@@ -40,6 +40,7 @@ THE SOFTWARE.
 #include <utility>
 #include <vector>
 #include <algorithm>
+#include <locale>
 
 #ifdef CXXOPTS_NO_EXCEPTIONS
 #include <iostream>