From 973fc5c66ba47a348be2314588c933f93f216415 Mon Sep 17 00:00:00 2001
From: Xu Cheng <xucheng@me.com>
Date: Mon, 3 Nov 2014 14:37:59 +0800
Subject: [PATCH] GenerateHelptags: check whether DESTDIR exists

---
 cmake/GenerateHelptags.cmake | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/cmake/GenerateHelptags.cmake b/cmake/GenerateHelptags.cmake
index 4101ff6cbf..2e923ab45f 100644
--- a/cmake/GenerateHelptags.cmake
+++ b/cmake/GenerateHelptags.cmake
@@ -1,6 +1,12 @@
-file(TO_CMAKE_PATH
-  "$ENV{DESTDIR}/${CMAKE_INSTALL_PREFIX}/share/nvim/runtime/doc"
-  HELPTAGS_WORKING_DIRECTORY)
+if(ENV{DESTDIR})
+  file(TO_CMAKE_PATH
+    "$ENV{DESTDIR}/${CMAKE_INSTALL_PREFIX}/share/nvim/runtime/doc"
+    HELPTAGS_WORKING_DIRECTORY)
+else()
+  file(TO_CMAKE_PATH
+    "${CMAKE_INSTALL_PREFIX}/share/nvim/runtime/doc"
+    HELPTAGS_WORKING_DIRECTORY)
+endif()
 
 message(STATUS "Generating helptags in ${HELPTAGS_WORKING_DIRECTORY}.")