Building Python 3.7.1 - SSL module failed

Question

Building Python 3.7 from source runs into following error:

Failed to build these modules:
_hashlib              _ssl                                     

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Answer 1

I solved it after 3 days only because of this blog. with python 3.7.4 openssl 1.1.0 centOS 6.

here is the summary :

First, some prerequisites:

sudo apt-get install build-essential checkinstall libreadline-gplv2-dev libncursesw5-dev libsqlite3-dev tk-dev libgdbm-dev libc6-dev libbz2-dev

use yum instead of apt-get if using centos linux.

Install ssl 1.0.2 or higher.

    cd /usr/src
    curl https://www.openssl.org/source/openssl-1.0.2o.tar.gz | tar xz
    cd openssl-1.0.2o
    ./config shared --prefix=/usr/local/
    sudo make
    sudo make install

We will need to pass /usr/src/openssl-1.0.2o into the Python configure script.

mkdir lib
cp ./*.{so,so.1.0.0,a,pc} ./lib

Now proceed with installing Python:

    cd /usr/src
    sudo wget https://www.python.org/ftp/python/3.7.0/Python-3.7.0.tgz
    sudo tar xzf Python-3.7.0.tgz
    cd Python-3.7.0
    ./configure --with-openssl=/usr/src/openssl-1.0.2o --enable-optimizations
    sudo make
    sudo make altinstall

To test it out, run python3.7 and input:

import ssl
ssl.OPENSSL_VERSION

Hope it helps!

Answer 2

On CentOS / Linux 2 if you install openssl using

sudo yum install -y openssl-devel

then the library is installed to /usr/local/lib64, and you can configure Python as follows:

./configure --enable-shared --with-openssl=/usr/local/lib64

there are step-by-step instructions here: How to Install Latest (2020) Django to AWS EC2 Linux 2 Instance and Serve w/ Apache Hello World

Answer 3

Here is a solution on Mac OS X / Homebrew:

brew reinstall openssl
brew unlink openssl && brew link openssl --force  # careful!
export LDFLAGS="-L/usr/local/opt/openssl/lib"
export CPPFLAGS="-I/usr/local/opt/openssl/include"
echo 'export PATH="/usr/local/opt/openssl/bin:$PATH"' >> ~/.bash_profile

Then download your python tarball and do this:

tar xvf Python-3.7.2.tar
cd Python-3.7.2
  ./configure CPPFLAGS="-I/usr/local/opt/openssl/include" LDFLAGS="-L/usr/local/opt/openssl/lib" --prefix=$PWD/Python-3.7.2/mybuild --enable-optimizations

More detai:

https://devguide.python.org/setup/#macos-and-os-x

Answer 4

Edit setup.py

Find the following lines:

        system_lib_dirs = ['/lib64', '/usr/lib64', '/lib', '/usr/lib']
    system_include_dirs = ['/usr/include']

...and place each folder at the beginning of its respective list.

---

In my case I had to add: /usr/local/lib and /usr/local/include:

        system_lib_dirs = ['/usr/local/lib', '/lib64', '/usr/lib64', '/lib', '/usr/lib']
    system_include_dirs = ['/usr/local/include', '/usr/include']

Finally: make distclean && ./configure

You may want to ensure that export LD_LIBRARY_PATH=/usr/local/lib:$LD_LIBRARY_PATH (or what have you) is added to the very end of /etc/profile and reboot, as well.

Answer 5

Compiling openssl

Download your openssl tarball, unzip, and then ensure that the install directory is named openssl.

I placed mine in /usr/local/openssl, so I'll use that in my example.

1. sudo mv openssl-1.0.2u /usr/local/openssl && cd /usr/local/openssl

2. sudo make distclean

3. sudo ./config -fPIC -shared

4. sudo make && sudo install

   Now, add the openssl shared library to your PATH.

5. vim ~/.profile Go export PATH="/usr/local/openssl/lib:$PATH" :wq

Compiling Python3

The key here is understanding that the path you define with --with-openssl= is where Python looks for /openssl/lib. You need to give Python the parent directory of the openssl directory.

That means that if you set --with-openssl=/usr/local/openssl your make install will fail even though the make logs show that openssl is fine!

--enable-optimizations is irrelevant but recommended - longer make for 10% faster Python code is a good tradeoff.

--prefix= is merely where I'd like python3 to install, if you didn't know.

1. sudo make distclean

   Edit your python setup file

2. vim /{yourpythonsource}/Modules/Setup

   Uncomment out the following lines and ensure that your SSL variable points to your openssl directory. In mine, it was looking for the directory 'ssl' instead of 'openssl.'

   # Socket module helper for SSL support; you must comment out the other

   # socket line above, and possibly edit the SSL variable:

   SSL=/usr/local/openssl _ssl _ssl.c \ -DUSE_SSL -I$(SSL)/include -I$(SSL)/include/openssl \ -L$(SSL)/lib -lssl -lcrypto

3. sudo ./configure --with-openssl=/usr/local --prefix=/opt/python-3.7.1

4. sudo make && sudo make install

Answer 6

While this might not be the best answer, I will share how I solved this problem.

1. First of all, in my case, OpenSSL did not build correctly, as make test did return errors (and consequently Python gave this error). This was solved by installing a newer version of Perl and then installing OpenSSL again (configure, make, etc).

2. Use this command before using ./configure

   export LD_LIBRARY_PATH=/path/to/openssl/lib:$LD_LIBRARY_PATH

3. At the configure command, include the library:

   LDFLAGS="-L/path/to/openssl/lib" ./configure (all your preferred options) --with-openssl=/path/to/openssl

   as apparently the option for configure does not convey the message to the C compiler which needs it.

Am not sure whether option 2 and 3 are needed simultaneously, but I did so and it worked.