SCons User Guide 0.97
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Checking for the Availability of a Function

Check for the availability of a specific function using the CheckFunc method: 

    env = Environment()
    conf = Configure(env)
    if not conf.CheckFunc('strcpy'):
        print 'Did not find strcpy(), using local version'
        conf.env.Append('-Dstrcpy=my_local_strcpy')
    env = conf.Finish()
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