From 1ab6e01de219b5d6c100da2ee31638825dccb63e Mon Sep 17 00:00:00 2001
From: John Reiser <jreiser@BitWagon.com>
Date: Sun, 14 Feb 2021 13:23:19 -0800
Subject: [PATCH] MacOS BigSur wants no MH_DYLDLINK for our MH_EXECUTE

https://github.com/upx/upx/issues/434
	modified:   p_mach.cpp
---
 src/p_mach.cpp | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/p_mach.cpp b/src/p_mach.cpp
index b6d91b6b..c8ce9db7 100644
--- a/src/p_mach.cpp
+++ b/src/p_mach.cpp
@@ -1194,7 +1194,11 @@ void PackMachBase<T>::pack1(OutputFile *const fo, Filter &/*ft*/)  // generate e
     mhdro = mhdri;
     if (my_filetype==Mach_header::MH_EXECUTE) {
         memcpy(&mhdro, stub_main, sizeof(mhdro));
-        mhdro.flags = mhdri.flags;
+        mhdro.flags = mhdri.flags & ~(
+              Mach_header::MH_DYLDLINK  // no dyld at this time
+            | Mach_header::MH_TWOLEVEL  // dyld-specific
+            | Mach_header::MH_BINDATLOAD  // dyld-specific
+            );
         COMPILE_TIME_ASSERT(sizeof(mhdro.flags) == sizeof(unsigned))
     }
     unsigned pos = sizeof(mhdro);