pip install pyspider  不成功

 ERROR: Complete output from command python setup.py egg_info:

    ERROR: Please specify --curl-dir=/path/to/built/libcurl

    ----------------------------------------

ERROR: Command "python setup.py egg_info" failed with error code 10 in C:\Users\xu_qi\AppData\Local\Temp\pip-install-_g7qb7wr\pycurl\