From 73dcba5181e6dd7937aa83958a54cabaea8c3576 Mon Sep 17 00:00:00 2001
From: Brad King <brad.king@kitware.com>
Date: Thu, 9 Apr 2015 08:02:40 -0400
Subject: [PATCH] Simplify logic to compute install prefix in OS X CMake.app

Also avoid explicitly dereferencing a variable in an if() condition.
---
 CMakeLists.txt | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index d86ae96cc..e979d4f38 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -543,10 +543,7 @@ if(NOT CMake_TEST_EXTERNAL_CMAKE)
         "${CMake_VERSION_MAJOR}.${CMake_VERSION_MINOR}.${CMake_VERSION_PATCH}")
       set(CMAKE_BUNDLE_LOCATION "${CMAKE_INSTALL_PREFIX}")
       # make sure CMAKE_INSTALL_PREFIX ends in /
-      string(LENGTH "${CMAKE_INSTALL_PREFIX}" LEN)
-      math(EXPR LEN "${LEN} -1" )
-      string(SUBSTRING "${CMAKE_INSTALL_PREFIX}" ${LEN} 1 ENDCH)
-      if(NOT "${ENDCH}" STREQUAL "/")
+      if(NOT CMAKE_INSTALL_PREFIX MATCHES "/$")
         set(CMAKE_INSTALL_PREFIX "${CMAKE_INSTALL_PREFIX}/")
       endif()
       set(CMAKE_INSTALL_PREFIX