diff -up OpenCV-2.3.1/CMakeLists.txt.00 OpenCV-2.3.1/CMakeLists.txt
--- OpenCV-2.3.1/CMakeLists.txt.00	2011-10-04 23:10:12.177001665 -0500
+++ OpenCV-2.3.1/CMakeLists.txt	2011-10-04 23:11:39.808001668 -0500
@@ -665,9 +665,9 @@ if(CMAKE_HOST_UNIX)
                     OUTPUT_VARIABLE PYTHON_STD_PACKAGES_PATH
                     OUTPUT_STRIP_TRAILING_WHITESPACE)
     if("${PYTHON_STD_PACKAGES_PATH}" MATCHES "site-packages")
-        set(PYTHON_PACKAGES_PATH lib/python${PYTHON_VERSION_MAJOR_MINOR}/site-packages CACHE PATH "Where to install the python packages.")
+        set(PYTHON_PACKAGES_PATH lib${LIB_SUFFIX}/python${PYTHON_VERSION_MAJOR_MINOR}/site-packages CACHE PATH "Where to install the python packages.")
     else() #debian based assumed, install to the dist-packages.
-        set(PYTHON_PACKAGES_PATH lib/python${PYTHON_VERSION_MAJOR_MINOR}/dist-packages CACHE PATH "Where to install the python packages.")
+        set(PYTHON_PACKAGES_PATH lib${LIB_SUFFIX}/python${PYTHON_VERSION_MAJOR_MINOR}/dist-packages CACHE PATH "Where to install the python packages.")
     endif()
 endif()
 if(CMAKE_HOST_WIN32)