From 62ede403f02c873177c9043718cecf3941f8a17e Mon Sep 17 00:00:00 2001
From: Albert Safin <xzfcpw@gmail.com>
Date: Mon, 3 Nov 2014 19:05:46 +0600
Subject: [PATCH] CMake: Fix checking of DESTDIR

---
 cmake/InstallHelpers.cmake | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/cmake/InstallHelpers.cmake b/cmake/InstallHelpers.cmake
index faf980bd47..bf1ef1c0d6 100644
--- a/cmake/InstallHelpers.cmake
+++ b/cmake/InstallHelpers.cmake
@@ -22,7 +22,7 @@ function(create_install_dir_with_perms)
 
   install(CODE
     "
-    if(ENV{DESTDIR})
+    if(DEFINED ENV{DESTDIR})
       set(PREFIX \$ENV{DESTDIR}/\${CMAKE_INSTALL_PREFIX})
     else()
       set(PREFIX \${CMAKE_INSTALL_PREFIX})