From e1db115f9b2a7242696137a760467adcb796a6a0 Mon Sep 17 00:00:00 2001
From: Francois Keith <keith@lirmm.fr>
Date: Tue, 3 Sep 2013 22:27:27 +0200
Subject: [PATCH] Allow defining the eigen version required before calling
 SEARCH_FOR_EIGEN.

---
 eigen.cmake | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/eigen.cmake b/eigen.cmake
index 60a79014a..3c4b5e154 100644
--- a/eigen.cmake
+++ b/eigen.cmake
@@ -17,11 +17,16 @@
 # -----------------
 #
 # This macro gets eigen include path from pkg-config file, and adds it include directories.
+
+# If the variable Eigen_REQUIRED is not defined before calling
+#  the method SEARCH_FOR_EIGEN, the version chosen is the default one.
 MACRO(SEARCH_FOR_EIGEN)
 
   SET(_Eigen_FOUND 0)
-  SET(_Eigen_REQUIRED "eigen3 >= 3.0.0")
-  PKG_CHECK_MODULES(_Eigen REQUIRED ${_Eigen_REQUIRED})
+  IF(NOT Eigen_REQUIRED)
+    SET(Eigen_REQUIRED "eigen3 >= 3.0.0")
+  ENDIF(NOT Eigen_REQUIRED)
+  PKG_CHECK_MODULES(_Eigen REQUIRED ${Eigen_REQUIRED})
   
   IF(NOT ${_Eigen_FOUND})
     MESSAGE(FATAL_ERROR "Check that package Eigen is installed in a directory pointed out by PKG_CONFIG_PATH.")