From 18365587c86396f988e256b5acf4d2312f3be2bb Mon Sep 17 00:00:00 2001
From: Antonio Rojas <arojas@archlinux.org>
Date: Sun, 25 Aug 2019 04:46:24 -0400
Subject: GNUInstallDirs: Keep 'lib' as default LIBDIR on Arch Linux based
 systems

Fixes: #15373
---
 Modules/GNUInstallDirs.cmake | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/Modules/GNUInstallDirs.cmake b/Modules/GNUInstallDirs.cmake
index 4db4e18..f95e6e2 100644
--- a/Modules/GNUInstallDirs.cmake
+++ b/Modules/GNUInstallDirs.cmake
@@ -222,7 +222,8 @@ if(NOT DEFINED CMAKE_INSTALL_LIBDIR OR (_libdir_set
     # updated to the new default, unless the user explicitly changed it.
   endif()
   if(CMAKE_SYSTEM_NAME MATCHES "^(Linux|kFreeBSD|GNU)$"
-      AND NOT CMAKE_CROSSCOMPILING)
+      AND NOT CMAKE_CROSSCOMPILING
+      AND NOT EXISTS "/etc/arch-release")
     if (EXISTS "/etc/debian_version") # is this a debian system ?
       if(CMAKE_LIBRARY_ARCHITECTURE)
         if("${CMAKE_INSTALL_PREFIX}" MATCHES "^/usr/?$")
-- 
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