From 06171fd7aae5a9a96a5b7e86490fad98807ff458 Mon Sep 17 00:00:00 2001
From: Brad King <brad.king@kitware.com>
Date: Fri, 26 Mar 2021 09:44:57 -0400
Subject: GNUInstallDirs: Clarify that CMAKE_INSTALL_<dir> may be absolute

Fixes: #21991
---
 Modules/GNUInstallDirs.cmake | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/Modules/GNUInstallDirs.cmake b/Modules/GNUInstallDirs.cmake
index 37869fb..e149f4c 100644
--- a/Modules/GNUInstallDirs.cmake
+++ b/Modules/GNUInstallDirs.cmake
@@ -21,7 +21,10 @@ Inclusion of this module defines the following variables:
 
   Destination for files of a given type.  This value may be passed to
   the ``DESTINATION`` options of :command:`install` commands for the
-  corresponding file type.
+  corresponding file type.  It should typically be a path relative to
+  the installation prefix so that it can be converted to an absolute
+  path in a relocatable way (see ``CMAKE_INSTALL_FULL_<dir>``).
+  However, an absolute path is also allowed.
 
 ``CMAKE_INSTALL_FULL_<dir>``
 
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