From 72d6aa2672c91d10f8f58ee796ed8d44325faca4 Mon Sep 17 00:00:00 2001
From: Mark Adler <madler@alumni.caltech.edu>
Date: Wed, 28 Feb 2024 18:46:54 -0800
Subject: [PATCH] Reduce Windows header inclusion to speed up compilation.

---
 gzguts.h | 15 ++++++++++-----
 1 file changed, 10 insertions(+), 5 deletions(-)

diff --git a/gzguts.h b/gzguts.h
index a6485ab..71dea74 100644
--- a/gzguts.h
+++ b/gzguts.h
@@ -17,11 +17,16 @@
 #  define ZLIB_INTERNAL
 #endif
 
-#if defined(_WIN32) && !defined(_CRT_SECURE_NO_WARNINGS)
-#  define _CRT_SECURE_NO_WARNINGS
-#endif
-#if defined(_WIN32) && !defined(_CRT_NONSTDC_NO_DEPRECATE)
-#  define _CRT_NONSTDC_NO_DEPRECATE
+#if defined(_WIN32)
+#  ifndef WIN32_LEAN_AND_MEAN
+#    define WIN32_LEAN_AND_MEAN
+#  endif
+#  ifndef _CRT_SECURE_NO_WARNINGS
+#    define _CRT_SECURE_NO_WARNINGS
+#  endif
+#  ifndef _CRT_NONSTDC_NO_DEPRECATE
+#    define _CRT_NONSTDC_NO_DEPRECATE
+#  endif
 #endif
 
 #include <stdio.h>