Index: CMakeLists.txt
===================================================================
--- a/CMakeLists.txt	(revision 195393)
+++ b/CMakeLists.txt	(working copy)
@@ -112,9 +112,15 @@ include(WebKitCommon)
 # -----------------------------------------------------------------------------
 # Output directories
 #------------------------------------------------------------------------------
-set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/lib)
-set(CMAKE_LIBRARY_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/lib)
-set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin)
+if (NOT CMAKE_ARCHIVE_OUTPUT_DIRECTORY)
+    set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/lib)
+endif ()
+if (NOT CMAKE_LIBRARY_OUTPUT_DIRECTORY)
+    set(CMAKE_LIBRARY_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/lib)
+endif ()
+if (NOT CMAKE_RUNTIME_OUTPUT_DIRECTORY)
+    set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin)
+endif ()
 
 # -----------------------------------------------------------------------------
 # Enable API unit tests and create a target for the test runner