Adding include path to Waf configuration (C++)

I've found an answer. You have to simply set the value of 'INCLUDES' to list of paths you want. Do not forget to run waf configure again :)

def configure(cfg):
    cfg.env.append_value('INCLUDES', ['include'])

I spent some time working out a good way to do this using the "use" option in bld.program() methods. Working with the boost libraries as an example, I came up with the following. I hope it helps!

'''
run waf with -v option and look at the command line arguments given
to the compiler for the three cases.

you may need to include the boost tool into waf to test this script.
'''
def options(opt):
    opt.load('compiler_cxx boost')

def configure(cfg):
    cfg.load('compiler_cxx boost')
    cfg.check_boost()

    cfg.env.DEFINES_BOOST = ['NDEBUG']

    ### the following line would be very convenient
    ###     cfg.env.USE_MYCONFIG = ['BOOST']
    ### but this works too:
    def copy_config(cfg, name, new_name):
        i = '_'+name
        o = '_'+new_name
        l = len(i)
        d = {}
        for key in cfg.env.keys():
            if key[-l:] == i:
                d[key.replace(i,o)] = cfg.env[key]
        cfg.env.update(d)

    copy_config(cfg, 'BOOST', 'MYCONFIG')

    # now modify the new env/configuration
    # this adds the appropriate "boost_" to the beginning
    # of the library and the "-mt" to the end if needed
    cfg.env.LIB_MYCONFIG = cfg.boost_get_libs('filesystem system')[-1]

def build(bld):

    # basic boost (no libraries)
    bld.program(target='test-boost2', source='test-boost.cpp',
                use='BOOST')

    # myconfig: boost with two libraries
    bld.program(target='test-boost',  source='test-boost.cpp',
                use='MYCONFIG')

    # warning:
    # notice the NDEBUG shows up twice in the compilation
    # because MYCONFIG already includes everything in BOOST
    bld.program(target='test-boost3', source='test-boost.cpp',
                use='BOOST MYCONFIG')