What to do if scrapy doesn't work after installing scrapy with pip on mac

When I installed scrapy using pip normally, I got the following error and it did not go well, so I will summarize the countermeasures

cffi.ffiplatform.VerificationError: importing '/PATH/.virtualenvs/hoge/lib/python2.7/site-packages/cryptography/_Cryptography_cffi_f3e4673fx399b1113.so': dlopen(/PATH/.virtualenvs/hoge/lib/python2.7/site-packages/cryptography/_Cryptography_cffi_f3e4673fx399b1113.so, 2): Symbol not found: _CRYPTO_malloc_debug_init
  Referenced from: /PATH/.virtualenvs/hoge/lib/python2.7/site-packages/cryptography/_Cryptography_cffi_f3e4673fx399b1113.so
  Expected in: flat namespace
 in /PATH/.virtualenvs/hoge/lib/python2.7/site-packages/cryptography/_Cryptography_cffi_f3e4673fx399b1113.so

Cause

Since I installed openssl via macports, it seems that the cause is that the link of openssl cannot be done well with cryptography.

Coping

Specifies to use macports lib when installing libraries with pip.

#Put scrapy normally
pip install scrapy

#Erase cryptography once
pip uninstall cryptography

#Specify to use macports lib etc. and re-enter
ARCHFLAGS="-arch x86_64" LDFLAGS="-L/opt/local/lib" CFLAGS="-I/opt/local/include" pip install cryptography

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