From a8be8b1b54fe1922a1d1fc0365c3ae5c918b6654 Mon Sep 17 00:00:00 2001
From: Christian Pfeiffer <cpfeiffer@live.de>
Date: Mon, 23 Oct 2017 13:36:47 +0200
Subject: GNUInstallDirs: Enable CMP0054

Fixes: #17381
---
 Modules/GNUInstallDirs.cmake | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/Modules/GNUInstallDirs.cmake b/Modules/GNUInstallDirs.cmake
index 64bd09e..91361d2 100644
--- a/Modules/GNUInstallDirs.cmake
+++ b/Modules/GNUInstallDirs.cmake
@@ -123,6 +123,9 @@
 #   allow users who create additional path variables to also compute
 #   absolute paths where necessary, using the same logic.
 
+cmake_policy(PUSH)
+cmake_policy(SET CMP0054 NEW) # if() quoted variables not dereferenced
+
 # Convert a cache variable to PATH type
 
 macro(_GNUInstallDirs_cache_convert_to_path var description)
@@ -371,3 +374,5 @@ foreach(dir
     )
   GNUInstallDirs_get_absolute_install_dir(CMAKE_INSTALL_FULL_${dir} CMAKE_INSTALL_${dir})
 endforeach()
+
+cmake_policy(POP)
-- 
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