From 809ffede4e61d5404cb3a17286b5a4fb843a33a3 Mon Sep 17 00:00:00 2001
From: Martin Quinson <martin.quinson@loria.fr>
Date: Wed, 9 Mar 2016 16:40:35 +0100
Subject: [PATCH] cmake: fight against empty definitions

---
 CMakeLists.txt | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 30b29781d0..7ab5b02ab7 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -330,7 +330,9 @@ foreach(var
   HAVE_PROCESS_VM_READV
   HAVE_MMAP
   HAVE_VASPRINTF)
-  if(NOT DEFINED ${var})
+  if(${var})
+    set(${var} 1)
+  else()
     set(${var} 0)
   endif()
 endforeach()
-- 
2.20.1