From d9a505ffb6b4c98677ea30803f17cad6ec1395ce Mon Sep 17 00:00:00 2001
From: James Zern <jzern@google.com>
Date: Tue, 17 Jan 2023 18:22:47 -0800
Subject: [PATCH] CMakeLists.txt: allow CMAKE_INSTALL_RPATH to be set empty

this allows the user to override the default non-empty value added in:
b4994eaa CMake: set rpath for shared objects

Bug: webp:592
Change-Id: I069dcbcd8c2f1e8654d9bc98149139f398ac2c93
Fixed: webp:592
---
 CMakeLists.txt | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 0a5af428..f378db5b 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -101,7 +101,7 @@ endif()
 include(cmake/deps.cmake)
 include(GNUInstallDirs)
 
-if(BUILD_SHARED_LIBS AND NOT CMAKE_INSTALL_RPATH)
+if(BUILD_SHARED_LIBS AND NOT DEFINED CMAKE_INSTALL_RPATH)
   # Set the rpath to match autoconf/libtool behavior. Note this must be set
   # before target creation.
   set(CMAKE_INSTALL_RPATH "${CMAKE_INSTALL_PREFIX}/${CMAKE_INSTALL_LIBDIR}")