diff -up ./CMakeLists.txt.fixcmake ./CMakeLists.txt
--- ./CMakeLists.txt.fixcmake	2016-12-28 11:39:51.690853423 -0500
+++ ./CMakeLists.txt	2016-12-28 11:41:06.409811065 -0500
@@ -511,7 +511,7 @@ set ( EIGEN_VERSION_MAJOR  ${EIGEN_WORLD
 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 ( EIGEN_INCLUDE_DIR ${INCLUDE_INSTALL_DIR} )
 set ( EIGEN_ROOT_DIR ${CMAKE_INSTALL_PREFIX} )
 
 # Interface libraries require at least CMake 3.0