From 1006ff8a7bc4ee77150d6f13483838c96789e3fc Mon Sep 17 00:00:00 2001
From: "Erik M. Bray" <erik.bray@lri.fr>
Date: Fri, 15 Mar 2019 15:06:30 +0100
Subject: [PATCH] Use POSIX getenv on Cygwin

The Windows-native GetEnvironmentVariable cannot be relied on, as
Cygwin does not always copy environment variables set through Cygwin
to the Windows environment block, particularly after fork().
---
 common.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/common.h b/common.h
index 7fcd5e316..f239c3d78 100644
--- a/common.h
+++ b/common.h
@@ -439,7 +439,7 @@ please https://github.com/xianyi/OpenBLAS/issues/246
 typedef char env_var_t[MAX_PATH];
 #define readenv(p, n) 0
 #else
-#ifdef OS_WINDOWS
+#if defined(OS_WINDOWS) && !defined(OS_CYGWIN_NT)
 typedef char env_var_t[MAX_PATH];
 #define readenv(p, n) GetEnvironmentVariable((LPCTSTR)(n), (LPTSTR)(p), sizeof(p))
 #else