$ sudo apt-get install libmpc-devOr on BSD systems with:
$ pkg_add -r mpc
Eventually, you will be able to install with just:
R > install.packages("mpc", repos = "http://R-Forge.R-project.org").
You can check out the latest source code for this R package with:
$ svn checkout svn://scm.r-forge.r-project.org/svnroot/mpc
An interface to the mpc library for the arithmetic of complex numbers with arbitrarily high precision and correct rounding of the result.
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The project summary page you can find here.