--- CMakeLists.txt	2016-11-21 08:29:42.000000000 +0100
+++ CMakeLists_patched.txt	2016-11-21 08:22:37.000000000 +0100
@@ -506,9 +506,15 @@
 set ( EIGEN_VERSION_MINOR  ${EIGEN_MAJOR_VERSION} )
 set ( EIGEN_VERSION_PATCH  ${EIGEN_MINOR_VERSION} )
 set ( EIGEN_DEFINITIONS "")
-set ( EIGEN_INCLUDE_DIR "${CMAKE_INSTALL_PREFIX}/${INCLUDE_INSTALL_DIR}" )
+
+set( CMAKECONFIG_INSTALL_DIR lib/cmake/eigen3 )
+file( RELATIVE_PATH REL_INCLUDE_DIR
+    "${CMAKE_INSTALL_PREFIX}/${CMAKECONFIG_INSTALL_DIR}"
+    ${CMAKE_INSTALL_PREFIX}/include/eigen3 )
+
+set ( EIGEN_INCLUDE_DIR "\${CMAKE_CURRENT_LIST_DIR}/${REL_INCLUDE_DIR}" )
 set ( EIGEN_INCLUDE_DIRS ${EIGEN_INCLUDE_DIR} )
-set ( EIGEN_ROOT_DIR ${CMAKE_INSTALL_PREFIX} )
+set ( EIGEN_ROOT_DIR "\${CMAKE_CURRENT_LIST_DIR}/../../.." )
 
 configure_file ( ${CMAKE_CURRENT_SOURCE_DIR}/cmake/Eigen3Config.cmake.in
                  ${CMAKE_CURRENT_BINARY_DIR}/Eigen3Config.cmake