@conf
def undefine(self, define):
	assert define and isinstance(define, str)

	tbl = self.env[DEFINES] or Utils.ordered_dict()

	value = UNDEFINED
	tbl[define] = value

	# add later to make reconfiguring faster
	self.env[DEFINES] = tbl
	self.env[define] = value
store a single define and its state into an internal list
dataset/ETHPy150Open appcelerator-archive/poc-nodejs-desktop/Resources/nodejs/builds/linux/node/lib/node/wafadmin/Tools/config_c.py/undefine