From 15f9fbbc9bd457b61a5e9838f3f9ba2545e4ede0 Mon Sep 17 00:00:00 2001
From: Ger Hobbelt <ger@hobbelt.com>
Date: Mon, 25 Oct 2021 11:41:02 +0200
Subject: [PATCH] fix build error on Windows due to incorrect RTL linkage for
 `environ`: must be a `dllimport`.

---
 src/cpp/subprocess/environ.cpp | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/src/cpp/subprocess/environ.cpp b/src/cpp/subprocess/environ.cpp
index 52fb88a..4f81e0f 100644
--- a/src/cpp/subprocess/environ.cpp
+++ b/src/cpp/subprocess/environ.cpp
@@ -6,7 +6,11 @@
 #include "utf8_to_utf16.hpp"
 using std::to_string;
 
-extern "C" char **environ;
+#if !defined(_DCRTIMP)     // Windows-specific RTL DLL import macro
+#define _DCRTIMP
+#endif
+
+extern "C" _DCRTIMP char **environ;
 
 namespace subprocess {
     Environ cenv;
@@ -131,4 +135,4 @@ namespace subprocess {
         result += (char16_t)'\0';
         return result;
     }
-}
\ No newline at end of file
+}