python pip install psycopg2 install error

Question

I did a simple pip install psycopg2 on mac system. It installed fine, but when I try to use psycopg2 I get the error:

Reason: Incompatible libra         


        

Answer 1

On OSX 10.11, El Capitan, solution with replacing symlinks reported Operation not permitted. Solution that worked for me was using brew and setting up DYLD_LIBRARY_PATH. So:

brew install openssl

Find where openssl brew libs are located (brew --prefix openssl can help), start searching from directory /usr/local/Cellar/openssl. In my case it is in /usr/local/Cellar/openssl/1.0.2d_1/lib

Finally set up DYLD_LIBRARY_PATH, i.e. add a line like this into .bash_profile :

# replace location of lib files with folder name you found in previous step
export DYLD_LIBRARY_PATH=$DYLD_LIBRARY_PATH:/usr/local/Cellar/openssl/1.0.2d_1/lib

UPDATE: More generic/better alternatives are (thanks to @dfrankow):

• to use brew to find openssl location (a note, brew can be slow): DYLD_LIBRARY_PATH=$DYLD_LIBRARY_PATH:$(brew --prefix openssl)/lib
• for development purposes maybe it is better to use DYLD_FALLBACK_LIBRARY_PATH instead - check this

Restart shell, or just source ~/.bash_profile, reinstall psycopg2:

pip uninstall psycopg2
pip install psycopg2

and test if it works:

$ python -c"import psycopg2  ;   print('psycopg2 is now ok')"