C:\blender\blender>scons BF_TOOLSET=mingw
scons: Reading SConscript files ...
Command-line arguments
        BF_TOOLSET = mingw
Command-line targets
        No targets given, using default
Using mingw
Using config file: config\win32-mingw-config.py
Using config file: user-config.py
  File "user-config.py", line 5

    BF_PYTHON_VERSION = '2.5 #(whatever version you have installed)

                                                                  ^

SyntaxError: EOL while scanning single-quoted string

C:\blender\blender>