adding -pythonpath cmd line arg

        parser.add_argument('-c', metavar=('file.cpp'), help='specify compile-only, no library linking.\n$ qcor -c src.cpp [outputs src.o for future linking]\n')

        parser.add_argument('-o', metavar=('object.o'), help='provide the name of the object file (if compile only) or executable (if compile and link or just link).\n$ qcor -o out.o -c src.cpp\n$ qcor -o out.exe src.cpp\n')

        parser.add_argument('file', help='you must specify the c++ source file name to compile.')

        parser.add_argument('-opt', nargs=1, help='specify optimization level for quantum circuit optimization.')

        parser.add_argument('-print-opt-stats', help='print circuit optimization pass statistics.')

        parser.add_argument('-I',action='append',nargs=1, metavar=('header_file.hpp'),help='specify additional headers to add to the include search path.')

        parser.add_argument('-L',action='append',nargs=1,metavar=('/path/to/libs'),help='specifiy additional linker search paths.')

        parser.add_argument('-l',action='append',nargs=1,metavar=('lib_name'),help='specifiy additional libraries to link.')

        parser.add_argument('-version', nargs=1, help='returns the current qcor build version.')

        args = parser.parse_args(sys.argv)

    if '-pythonpath' in sys.argv[1:]:

        if '@XACC_ROOT@' == '@CMAKE_INSTALL_PREFIX@':

            print('@XACC_ROOT@')

        else:

            print('@XACC_ROOT@:@CMAKE_INSTALL_PREFIX@')

        exit(0)

    if '-version' in sys.argv[1:]:

        version = open('@CMAKE_INSTALL_PREFIX@/include/qcor/qcor_version', 'r').read().rstrip()

        print('qcor build version = {}'.format(version))

        parser.add_argument('-I',action='append',nargs=1, metavar=('header_file.hpp'),help='specify additional headers to add to the include search path.')

        parser.add_argument('-L',action='append',nargs=1,metavar=('/path/to/libs'),help='specifiy additional linker search paths.')

        parser.add_argument('-l',action='append',nargs=1,metavar=('lib_name'),help='specifiy additional libraries to link.')

        parser.add_argument('-opt', nargs=1, help='specify optimization level for quantum circuit optimization.')

        parser.add_argument('-print-opt-stats', help='print circuit optimization pass statistics.')

        parser.add_argument('-set-credentials', nargs=1, help='set api key and other credential information for remote qpu.\nMust provide at least -key KEY arguments. For IBM also specify -hub HUB -group GROUP -project PROJECT.')

        parser.add_argument('-print-credentials', nargs=1, help='print remote api credentials for given qpu name.')

        parser.add_argument('-update-credentials', nargs=1, help='set a specific credential for remote qpu access. Example\nqcor -update-credentials ibm -project MYOTHERPROJECT.')

        parser.add_argument('-clear-jit-cache', help='delete existing QJIT cache.')

        parser.add_argument('-xacc-version', nargs=1, help='returns the current build version for underlying xacc install.')

        parser.add_argument('-version', nargs=1, help='returns the current qcor build version.')

        parser.add_argument('-pythonpath', help='print the correct PYTHONPATH to leverage qcor and xacc python API.')

        args = parser.parse_args(sys.argv)

    if '-pythonpath' in sys.argv[1:]:

        if '@XACC_ROOT@' == '@CMAKE_INSTALL_PREFIX@':

            print('@XACC_ROOT@')

        else:

            print('@XACC_ROOT@:@CMAKE_INSTALL_PREFIX@')

        exit(0)

    if '-version' in sys.argv[1:]:

        version = open('@CMAKE_INSTALL_PREFIX@/include/qcor/qcor_version', 'r').read().rstrip()

        print('qcor build version = {}'.format(version))