fix issue: cmake package does not set include path correctly

CMakeLists.txt

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 21f0546..116849c 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -124,31 +124,7 @@
 endif()
 
 #==============================================================================
-# Eigen Library.
-#==============================================================================
-
-set ( EIGEN_VERSION_STRING ${EIGEN_VERSION_NUMBER} )
-set ( EIGEN_VERSION_MAJOR  ${EIGEN_WORLD_VERSION} )
-set ( EIGEN_VERSION_MINOR  ${EIGEN_MAJOR_VERSION} )
-set ( EIGEN_VERSION_PATCH  ${EIGEN_MINOR_VERSION} )
-
-# Imported target support
-add_library (eigen INTERFACE)
-add_library (Eigen3::Eigen ALIAS eigen)
-target_include_directories (eigen INTERFACE
-  $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}>
-  $<INSTALL_INTERFACE:${INCLUDE_INSTALL_DIR}>
-)
-
-# Export as title case Eigen
-set_target_properties (eigen PROPERTIES EXPORT_NAME Eigen)
-
-# Alias Eigen_*_DIR to Eigen3_*_DIR:
-set(Eigen_SOURCE_DIR ${Eigen3_SOURCE_DIR})
-set(Eigen_BINARY_DIR ${Eigen3_BINARY_DIR})
-
-#==============================================================================
-# Install Configuration.
+# Install Path Configuration.
 #==============================================================================
 
 # Unconditionally allow install of targets to support nested dependency
@@ -190,6 +166,34 @@
   endif()
 endforeach()
 
+#==============================================================================
+# Eigen Library.
+#==============================================================================
+
+set ( EIGEN_VERSION_STRING ${EIGEN_VERSION_NUMBER} )
+set ( EIGEN_VERSION_MAJOR  ${EIGEN_WORLD_VERSION} )
+set ( EIGEN_VERSION_MINOR  ${EIGEN_MAJOR_VERSION} )
+set ( EIGEN_VERSION_PATCH  ${EIGEN_MINOR_VERSION} )
+
+# Alias Eigen_*_DIR to Eigen3_*_DIR:
+set(Eigen_SOURCE_DIR ${Eigen3_SOURCE_DIR})
+set(Eigen_BINARY_DIR ${Eigen3_BINARY_DIR})
+
+# Imported target support
+add_library (eigen INTERFACE)
+add_library (Eigen3::Eigen ALIAS eigen)
+target_include_directories (eigen INTERFACE
+  $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}>
+  $<INSTALL_INTERFACE:${INCLUDE_INSTALL_DIR}>
+)
+
+# Export as title case Eigen
+set_target_properties (eigen PROPERTIES EXPORT_NAME Eigen)
+
+#==============================================================================
+# Install Rule Configuration.
+#==============================================================================
+
 install(FILES
   signature_of_eigen3_matrix_library
   DESTINATION ${INCLUDE_INSTALL_DIR} COMPONENT Devel