The mpdecimal project offers a C library called libmpdec for decimal floating point arithmetic, which is based on the General Decimal Arithmetic Specification and conforms to the IEEE 754-2008 Standard. It is used in Python's decimal module and is also available as a C++ library called libmpdec++. Both libraries support various architectures and operating systems. There is also a Python module called cdecimal that offers faster performance with a speedup of up to 80x compared to the standard decimal module.
don't have tea/gui yet? download here
Copy the tea one-liner above into your terminal to install mpdecimal. tea will interpret the documentation and take care of any dependencies.