Index: CMakeLists.txt
--- CMakeLists.txt.orig
+++ CMakeLists.txt
@@ -90,7 +90,7 @@ endif()
 
 # Set BOOST_ROOT to help CMake to find the right Boost version
 find_package(Boost 1.49.0
-  REQUIRED date_time filesystem system iostreams regex unit_test_framework
+  REQUIRED date_time filesystem iostreams regex unit_test_framework
   ${BOOST_PYTHON} OPTIONAL_COMPONENTS nowide)
 
 # enable Boost::nowide library (for UTF8 command line args on Windows)
