def clang_modifier_darwin(conf):
    """Configuration flags for executing clang on MacOS"""
    v = conf.env
    v['CFLAGS_cshlib']       = ['-fPIC', '-compatibility_version', '1', '-current_version', '1']
    v['LINKFLAGS_cshlib']    = ['-dynamiclib']
    v['cshlib_PATTERN']      = 'lib%s.dylib'
    v['FRAMEWORKPATH_ST']    = '-F%s'
    v['FRAMEWORK_ST']        = ['-framework']
    v['ARCH_ST']             = ['-arch']

    v['LINKFLAGS_cstlib']    = []

    v['SHLIB_MARKER']        = []
    v['STLIB_MARKER']        = []
    v['SONAME_ST']           = []