diff -urN OpenCV-2.3.1-orig/CMakeLists.txt OpenCV-2.3.1/CMakeLists.txt
--- OpenCV-2.3.1-orig/CMakeLists.txt	2011-08-17 22:42:55.000000000 +0300
+++ OpenCV-2.3.1/CMakeLists.txt	2011-08-19 13:40:08.785540389 +0300
@@ -665,9 +665,9 @@
                     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)