SSL backend error when using OpenSSL
Solution 1:
for most people
After reading their INSTALLATION file, I was able to solve my problem by setting an environment variable and did a reinstall
# remove existing `pycurl` installation
pip uninstall pycurl
# export variable with your link-time ssl backend (which is openssl above)
export PYCURL_SSL_LIBRARY=openssl
# then, re-install `pycurl` with **no cache**
pip install pycurl --no-cache-dir
There could be other solution out there but this works perfectly for me on a virtualenv
and pip
installation.
Some people have a different error message complaining about nss
instead of openssl
ImportError: pycurl: libcurl link-time ssl backend (nss)
(the key part is nss
) so you have to do something different for this error message:
pip uninstall pycurl
pip install --no-cache-dir --compile --compile-options="--with-nss" pycurl
Solution 2:
helloworld2013's answer is correct, but the key is matching the SSL library that pycurl is expecting. The error will be something like:
pycurl: libcurl link-time ssl backend (<library>) is different from compile-time ssl backend (<library> or "none/other")
To fix it, you have to use the library pycurl is expecting. In my case, my error was "pycurl: libcurl link-time ssl backend (nss) is different from compile-time ssl backend (openssl)", so my fix was:
pip uninstall pycurl
export PYCURL_SSL_LIBRARY=nss
pip install pycurl
Solution 3:
With macOS 10.13, a brew-installed openSSL, and virtualenv, I was successful with:
# cd to your virtualenv, then…
pip uninstall pycurl
export PYCURL_SSL_LIBRARY=openssl
export LDFLAGS=-L/usr/local/opt/openssl/lib
export CPPFLAGS=-I/usr/local/opt/openssl/include
pip install pycurl --compile --no-cache-dir
Solution 4:
With pip 7.1 you can put the following in your requirements file:
pycurl==7.19.5.1 --global-option="--with-nss"
Simply replace nss with the relevant ssl backend library.