From 9ce7a663d6d50c6f2d7a3fbc76ed10c5af6a91a5 Mon Sep 17 00:00:00 2001
From: Brad King <brad.king@kitware.com>
Date: Tue, 7 Jul 2015 09:38:48 -0400
Subject: [PATCH] Utilities/Sphinx: Add CMake_OPTIONAL_COMPONENT macro

When building this directory independently define the macro since we
will not get the definition from the top level of the source tree.
---
 Utilities/Sphinx/CMakeLists.txt | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Utilities/Sphinx/CMakeLists.txt b/Utilities/Sphinx/CMakeLists.txt
index 77a12558a..1baca35e4 100644
--- a/Utilities/Sphinx/CMakeLists.txt
+++ b/Utilities/Sphinx/CMakeLists.txt
@@ -19,6 +19,9 @@ if(NOT CMake_SOURCE_DIR)
   include(${CMake_SOURCE_DIR}/Source/CMakeInstallDestinations.cmake)
   unset(CMAKE_DATA_DIR)
   unset(CMAKE_DATA_DIR CACHE)
+  macro(CMake_OPTIONAL_COMPONENT)
+    set(COMPONENT "")
+  endmacro()
 endif()
 project(CMakeHelp NONE)