Failed to install Python Cryptography package with PIP and setup.py

Failed to install Python Cryptography package with PIP and setup.py

Asked on November 12, 2018 in Python.
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  • 3 Answer(s)

        I had an analogous issue, and located i used to be merely missing a dependancy (libssl-dev, for me). As documented in https://cryptography.io/en/latest/installation/, make sure that all dependancies square measure met:

    On Windows

         If you’re on Windows you’ll got to confirm you’ve got OpenSSL put in. There square measure pre-compiled binaries accessible. If your installation is in associate uncommon location set the LIB and embrace atmosphere variables to incorporate the corresponding locations. For example:

    C:\> \path\to\vcvarsall.bat x86_amd64
    C:\> set LIB=C:\OpenSSL-1.0.1f-64bit\lib;%LIB%
    C:\> set INCLUDE=C:\OpenSSL-1.0.1f-64bit\include;%INCLUDE%
    C:\> pip install cryptography
    

    Building cryptography on UNIX system

        cryptography ought to build terribly simply on UNIX system provided you’ve got a compiler, headers for Python (if you’re not mistreatment pypy), and headers for the OpenSSL and libffi libraries accessible on your system.
    For Debian and Ubuntu, the subsequent command can make sure that the desired dependencies square measure installed:

    sudo apt-get install build-essential libssl-dev libffi-dev python-dev
    

         For felt hat and RHEL-derivatives, the subsequent command can make sure that the desired dependencies square measure installed:

    sudo yum install gcc libffi-devel python-devel openssl-devel
    

    You should currently be able to build and install cryptography with the same old.

    pip install cryptography
    
    Answered on November 12, 2018.
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    For those of you running OS X, here is what worked for me:

    brew install openssl
    env ARCHFLAGS="-arch x86_64" LDFLAGS="-L/usr/local/opt/openssl/lib" CFLAGS="-I/usr/local/opt/openssl/include"
    pip install cryptography
    

    (Running 10.9 Mavericks)
    You may conjointly wish to undertake merging the flags and pip commands to the subsequent per the comment below:

    brew install openssl
    env ARCHFLAGS="-arch x86_64" LDFLAGS="-L/usr/local/opt/openssl/lib" CFLAGS="-I/usr/local/opt/openssl/include" pip install cryptography
    
    Answered on November 12, 2018.
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    Actually this is best and working method in El Capitan

    brew install pkg-config libffi openssl
    env LDFLAGS="-L$(brew --prefix openssl)/lib" CFLAGS="-I$(brew --prefix openssl)/include" pip install cryptography
    

     

    Answered on November 12, 2018.
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