From 602b048089d0035dfc7140c993e404aeae7c8a09 Mon Sep 17 00:00:00 2001
From: BtbN <btbn@btbn.de>
Date: Sun, 25 May 2014 16:37:49 +0200
Subject: [PATCH] Unset cached variables on failure in Jansson find module

---
 cmake/Modules/FindJansson.cmake | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/cmake/Modules/FindJansson.cmake b/cmake/Modules/FindJansson.cmake
index 001a4ee2b..fc17eeb2c 100644
--- a/cmake/Modules/FindJansson.cmake
+++ b/cmake/Modules/FindJansson.cmake
@@ -59,5 +59,10 @@ else()
 		REQUIRED_VARS Jansson_LIB Jansson_INCLUDE_DIR
 		VERSION_VAR JANSSON_VERSION)
 	mark_as_advanced(Jansson_INCLUDE_DIR Jansson_LIB)
+
+	if(NOT JANSSON_FOUND)
+		unset(JANSSON_INCLUDE_DIRS CACHE)
+		unset(JANSSON_LIBRARIES CACHE)
+	endif()
 endif()