From 6cced7872557fe92228114ce6bf55a30ef91e358 Mon Sep 17 00:00:00 2001
From: Frank Benkstein <frank@benkstein.net>
Date: Mon, 19 Feb 2018 17:50:16 +0100
Subject: FindLua: Fix error when LUA_INCLUDE_PREFIX is set as a variable

We use `LUA_INCLUDE_PREFIX` for the result of an internal `find_path`
call and unset the cache entry before each use.  Unset a plain variable
of this name too in case it was set by project code.  Otherwise the
`find_path` call may be skipped and the wrong value used, leading to
errors.
---
 Modules/FindLua.cmake | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Modules/FindLua.cmake b/Modules/FindLua.cmake
index b59b9b3..7eba206 100644
--- a/Modules/FindLua.cmake
+++ b/Modules/FindLua.cmake
@@ -122,6 +122,7 @@ endif ()
 if (NOT LUA_VERSION_STRING)
     foreach (subdir IN LISTS _lua_include_subdirs)
         unset(LUA_INCLUDE_PREFIX CACHE)
+        unset(LUA_INCLUDE_PREFIX)
         find_path(LUA_INCLUDE_PREFIX ${subdir}/lua.h
           HINTS
             ENV LUA_DIR
-- 
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