BUG#682: Adding environment variable check to FIND_PACKAGE command.

Modules/FindITK.cmake

@@ -45,6 +45,9 @@ IF(NOT ITK_DIR)
   # Look for an installation or build tree.
   #
   FIND_PATH(ITK_DIR ITKConfig.cmake
+    # Look for an environment variable ITK_DIR.
+    $ENV{ITK_DIR}
+
     # Look in places relative to the system executable search path.
     ${ITK_DIR_SEARCH}
 

Modules/FindVTK.cmake

@@ -65,6 +65,9 @@ IF(NOT VTK_DIR)
     # Support legacy cache files.
     ${VTK_DIR_SEARCH_LEGACY}
 
+    # Look for an environment variable VTK_DIR.
+    $ENV{VTK_DIR}
+
     # Look in places relative to the system executable search path.
     ${VTK_DIR_SEARCH}