I really like M2Crypto, but it is difficult to install on OSX without a few annoying prerequisites. Assuming you are running Leopard (or, I guess, newer), this is what you need to do:
First, you need to install the XCode Developer Tools. You probably have these installed already, but if not, they're on your OS install discs, or you can download them from Apple. Once they're installed, you should have a working C compiler. Test with:
$ gcc i686-apple-darwin9-gcc-4.0.1: no input files
Now, you need to install the OpenSSL headers. Grab the latest OpenSSL package from here. Now, unpack and build it. You might want to put the kettle on, this takes a little while.
$ tar xzf openssl-x.x.x.tar.gz $ cd openssl-x-x-x $ ./config --prefix=/usr/local $ make && make test $ sudo make install
Next, download SWIG. Again, this needs unpacking and building:
$ tar xzf swig-x.x.x.tar.gz $ cd swig-x.x.x $ ./configure --prefix=/usr/local $ make $ sudo make install
Finally, you need to download and install M2Crypto. Grab the source, and install it as follows:
$ tar xzf M2Crypto-x.x $ cd M2Crypto-x.x $ python setup.py build build_ext --openssl=/usr/local $ sudo python setup.py install build_ext --openssl=/usr/local
Then to test your installation, simply do the following:
$ python Python 2.5.1 (r251:54863, Jan 17 2008, 19:35:17) [GCC 4.0.1 (Apple Inc. build 5465)] on darwin Type "help", "copyright", "credits" or "license" for more information. >>> import M2Crypto >>>
Date: 9th October 2008.
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