+SYS_WX_CONFIG = None # When installing an in tree build, setup.py uses wx-config
+ # for two different purposes. First, to determine the prefix
+ # where files will be installed, and secondly, to initialise
+ # build_options.py with the correct options for it.
+ # WX_CONFIG is used for the first task. SYS_WX_CONFIG may
+ # be set independently, to the value that should appear in
+ # build_options.py, if it is different to that. The default
+ # is to use the value of WX_CONFIG.
+