Building QuantLib on OS X Mountain Lion

Here are the steps to install QuantLib, a free/open-source library for quantitative finance, on OS X Mountain Lion:

Install MacPorts.
Install Boost using MacPorts by running this command:
sudo port install boost
This will install Boost and its dependencies under /opt/local.
Download and extract the QuantLib sources.

Configure QuantLib by running:
./configure --with-boost-include=/opt/local/include --with-boost-lib=/opt/local/lib/
Run make, followed by sudo make install.

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