diff --git a/vlsisapd/cmake_modules/FindIO.cmake b/vlsisapd/cmake_modules/FindIO.cmake
index 47332682..a205c3e0 100644
--- a/vlsisapd/cmake_modules/FindIO.cmake
+++ b/vlsisapd/cmake_modules/FindIO.cmake
@@ -7,6 +7,27 @@
 
 SET(IO_FOUND FALSE)
 
+# Setup the DIR_SEARCH_PATH.
+MACRO(SETUP_SEARCH_DIR project)
+  IF( NOT("$ENV{${project}_USER_TOP}" STREQUAL "") )
+    MESSAGE("-- ${project}_USER_TOP is set to $ENV{${project}_USER_TOP}")
+    LIST(FIND ${project}_DIR_SEARCH "${${project}_DIR_SEARCH}" DIR_INDEX)
+    IF( DIR_INDEX LESS 0)
+      LIST(INSERT ${project}_DIR_SEARCH 0 "$ENV{${project}_USER_TOP}")
+    ENDIF( DIR_INDEX LESS 0)
+  ENDIF( NOT("$ENV{${project}_USER_TOP}" STREQUAL "") )
+  
+  IF( NOT("$ENV{${project}_TOP}" STREQUAL "") )
+    MESSAGE("-- ${project}_TOP is set to $ENV{${project}_TOP}")
+    LIST(FIND ${project}_DIR_SEARCH "${${project}_DIR_SEARCH}" DIR_INDEX)
+    IF( DIR_INDEX LESS 0)
+      LIST(INSERT ${project}_DIR_SEARCH 0 "$ENV{${project}_TOP}")
+    ENDIF( DIR_INDEX LESS 0)
+  ENDIF( NOT("$ENV{${project}_TOP}" STREQUAL "") )
+ENDMACRO(SETUP_SEARCH_DIR project)
+
+SETUP_SEARCH_DIR(IO)
+
 IF(IO_DIR_SEARCH)
     # AGDS
     FIND_PATH(AGDS_INCLUDE_DIR