Trouble installing m2crypto with pip on OS X / macOS - macos

Question

pip install m2crypto
Generates the following output:
building 'M2Crypto.__m2crypto' extension
swigging SWIG/_m2crypto.i to SWIG/_m2crypto_wrap.c
swig -python -I/System/Library/Frameworks/Python.framework/Versions/2.7/include/python2.7 -I/usr/include -I/usr/include/openssl -includeall -modern -o SWIG/_m2crypto_wrap.c SWIG/_m2crypto.i
SWIG/_m2crypto.i:30: Error: Unable to find 'openssl/opensslv.h'
SWIG/_m2crypto.i:33: Error: Unable to find 'openssl/safestack.h'
SWIG/_evp.i:12: Error: Unable to find 'openssl/opensslconf.h'
SWIG/_ec.i:7: Error: Unable to find 'openssl/opensslconf.h'
error: command 'swig' failed with exit status 1
I've run:
brew install swig

Answer 1

I wanted a nicer way without installing manually and using only Homebrew (which also does not link openssl by default). Also using pip was a requirement. This seems to work with newest m2crypto 0.22.5. I also tested it once with m2crypto 0.22.3 and seems also to work. The OpenSSL version here is 1.0.2d:
brew install openssl
brew install swig
Finally install m2crypto on macOS in your Bash. It is a long command but it changes SWIG and clang environment variables only during pip install so that m2crypto will get all OpenSSL requirements:
env LDFLAGS="-L$(brew --prefix openssl)/lib" \
CFLAGS="-I$(brew --prefix openssl)/include" \
SWIG_FEATURES="-cpperraswarn -includeall -I$(brew --prefix openssl)/include" \
pip install m2crypto
btw. the last command also works if you use e.g. a requirements.txt.
Update:
Additional also the command for fish shell users...
env LDFLAGS="-L"(brew --prefix openssl)"/lib" \
CFLAGS="-I"(brew --prefix openssl)"/include" \
SWIG_FEATURES="-cpperraswarn -includeall -I"(brew --prefix openssl)"/include" \
pip install m2crypto

Answer 2

thanks to therealmarv env flags i was able to get this to work with the macports version of openssl/swig, this is what i did:
sudo port install openssl
sudo port install swig
sudo port install swig-python
then use therealmarv lines but replace "$(brew --prefix openssl)" with the dir from macports which should be "/opt/local"
sudo env LDFLAGS="-L/opt/local/lib" \
CFLAGS="-I/opt/local/include" \
SWIG_FEATURES="-cpperraswarn -includeall -I/opt/local/include" \
pip install M2Crypto

Answer 3

I just went through a lot of pain getting this working in El Capitan. Here is what I had to do:
Install OpenSSL (you have to use an older version, m2crypto will not compile otherwise)
curl -O https://www.openssl.org/source/openssl-0.9.8zg.tar.gz
tar -xvzf openssl-0.9.8zg.tar.gz
cd openssl-0.9.8zg
./Configure --prefix=/usr/local darwin64-x86_64-cc
make && make test
sudo make install
Install m2crypto
git clone https://github.com/martinpaljak/M2Crypto.git
cd M2Crypto
python setup.py build build_ext --openssl=/usr/local
sudo python setup.py install build_ext --openssl=/usr/local
AFAIK it is installed... I still have to do some testing though.

Answer 4

Got exact same issue on Ubuntu 18.04 LTS, while trying to execute
pip install M2Crypto==0.24.0
Did the following to get rid of it:
sudo apt-get install swig
sudo apt-get install libssl1.0-dev

Answer 5

This fixed my problem (Python 2.7):
export PYTHONPATH=$PYTHONPATH:/usr/local/lib/python2.7/site-packages

Answer 6

macos v10.15.6
m2crypto v0.35.6
pip v20
Solution by therealmarv works,
If the program does not take effect, you can try to upgrade your brew packages. Before the solution.
brew update # update homebrew self
brew upgrade # upgrade all

Answer 7

sudo apt-get install python-m2crypto