From 5e354fa844d21c8694dd60f44ce4f73dac122238 Mon Sep 17 00:00:00 2001
From: Kevin Squire <kevin@secondspectrum.com>
Date: Thu, 15 Jan 2015 18:13:06 -0800
Subject: [PATCH] Allow PYTHON_LIBRARY and PYTHON_INCLUDE_DIR to actually be
 overridden

---
 cmake/OpenCVDetectPython.cmake | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/cmake/OpenCVDetectPython.cmake b/cmake/OpenCVDetectPython.cmake
index 8ed425fb5a..ed75698210 100644
--- a/cmake/OpenCVDetectPython.cmake
+++ b/cmake/OpenCVDetectPython.cmake
@@ -75,10 +75,10 @@ function(find_python preferred_version min_version library_env include_dir_env
 
     if(NOT ANDROID AND NOT IOS)
       ocv_check_environment_variables(${library_env} ${include_dir_env})
-      if(${${library_env}})
+      if(NOT ${${library_env}} EQUAL "")
           set(PYTHON_LIBRARY "${${library_env}}")
       endif()
-      if(${${include_dir_env}})
+      if(NOT ${${include_dir_env}} EQUAL "")
           set(PYTHON_INCLUDE_DIR "${${include_dir_env}}")
       endif()