capybara/virtualenv/lib/python2.7/site.py
def setBEGINLIBPATH():
    """The OS/2 EMX port has optional extension modules that do double duty
    as DLLs (and must use the .DLL file extension) for other extensions.
    The library search path needs to be amended so these will be found
    during module import.  Use BEGINLIBPATH so that these are at the start
    of the library search path.

    """
    dllpath = os.path.join(sys.prefix, "Lib", "lib-dynload")
    libpath = os.environ['BEGINLIBPATH'].split(';')
    if libpath[-1]:
        libpath.append(dllpath)
    else:
        libpath[-1] = dllpath
    os.environ['BEGINLIBPATH'] = ';'.join(libpath)
def setBEGINLIBPATH():
    """The OS/2 EMX port has optional extension modules that do double duty
    as DLLs (and must use the .DLL file extension) for other extensions.
    The library search path needs to be amended so these will be found
    during module import.  Use BEGINLIBPATH so that these are at the start
    of the library search path.

    """
    dllpath = os.path.join(sys.prefix, "Lib", "lib-dynload")
    libpath = os.environ['BEGINLIBPATH'].split(';')
    if libpath[-1]:
        libpath.append(dllpath)
    else:
        libpath[-1] = dllpath
    os.environ['BEGINLIBPATH'] = ';'.join(libpath)
The OS/2 EMX port has optional extension modules that do double duty
    as DLLs (and must use the .DLL file extension) for other extensions.
    The library search path needs to be amended so these will be found
    during module import.  Use BEGINLIBPATH so that these are at the start
    of the library search path.