How to use the mk.makeCondition function in mk

# Handle conditional targets:
        condstr = evalConstExpr(e, e.props['cond'])
        typ = mk.evalCondition(condstr)
        # Condition never met, ignore the target:
        if typ == '0':
            utils.deadTargets.append(id)
            return
        # Condition always met:
        elif typ == '1':
            isCond = 0
        elif typ != None:
            raise ReaderError(e, "malformed condition: '%s'" % condstr)

        if isCond:
            checkConditionsSupport(e)
            cond = mk.makeCondition(condstr)
            if cond == None:
                raise ReaderError(e, "malformed condition: '%s'" % condstr)
        
    tags = rule.getTagsDict()
    e = applyTemplates(e, rule.getTemplates() + extractTemplates(e, post=0),
                          extractTemplates(e, post=1))

    if id in mk.targets:
        raise ReaderError(e, "duplicate target name '%s'" % id)

    if 'category' in e.props:
        try:
            cats = {
                'all'       : mk.Target.CATEG_ALL,
                'normal'    : mk.Target.CATEG_NORMAL,
                'automatic' : mk.Target.CATEG_AUTOMATIC

else:
                    return None
            else:
                return None
        ret = []
        for e in all:
            if all[e] is False:
                pass
            elif all[e] is True:
                ret.append("%s=='%s'" % (e.name, values[e]))
            else:
                return None                
        if len(ret) == 0:
            return '1'
        else:
            return mk.makeCondition(' and '.join(ret))

if '$' in v.value:
                    var.add(v.cond,
                            substitute2(v.value, callback, desc, cond2, hints))
                else:
                    if len(v.value) == 0 or v.value.isspace():
                        var.add(v.cond, v.value)
                    else:
                        var.add(v.cond, callback(cond2, v.value))
            return '$(%s)' % var.name

        if expr in mk.options and mk.options[expr].values != None:
            opt = mk.options[expr]
            var = mk.CondVar(makeUniqueCondVarName('%s_%s' % (opt.name, desc)))
            mk.addCondVar(var, hints)
            for v in opt.values:
                cond = mk.makeCondition("%s=='%s'" % (opt.name, v))
                cond2 = mk.mergeConditions(cnd, cond)
                if '$' in v:
                    var.add(cond, substitute2(v, callback, desc, cond2, hints))
                else:
                    if len(v) == 0 or v.isspace(): var.add(cond, v)
                    else: var.add(cond, callback(cond2, v))
            return '$(%s)' % var.name

        if expr in __substituteCallbacks:
            for func in __substituteCallbacks[expr]:
                rval = func(expr, callback, caller)
                if rval != None:
                    return rval
        raise errors.Error("'%s' can't be used in this context, "%expr +
                 "not a conditional variable or option with listed values")

# Condition never met when generating this target:
                    if typ == '0':
                        if config.debug:
                            print "[dbg] removing never-met condition '%s' for variable '%s'" % (condstr, name)
                        continue
                    # Condition always met:
                    elif typ == '1':
                        if config.debug:
                            print "[dbg] condition '%s' for variable '%s' is always met" % (condstr, name)
                        noValueSet = 0
                        isCond = 0
                        value = e_if.value
                        break
                    elif typ != None:
                        raise ReaderError(e, "malformed condition '%s': doesn't evaluate to boolean value" % condstr)
                    cond = mk.makeCondition(condstr)

                    noValueSet = 0
                    
                    # Real conditions:

                    checkConditionsSupport(e)
                    
                    if 'scope' in e.props:
                        raise ReaderError(e, "conditional variable can't have nondefault scope ('%s')" % e.props['scope'])

                    if target != None:
                        if (not overwrite) and (name in target.vars):
                            return
                        name = '__%s_%s' % (target.id.replace('-','_').replace('.','_').replace('/','_'),
                                            basename)
                        mk.setVar(e.props['var'], '$(%s)' % name,