Install ldc on FreeBSD from [http://www.freshports.org/lang/ldc-devel ports], which will also install the Tango standard library.

You can install using a pre-built binary pkg

{{{
pkg_add -r ldc-devel
}}}

or build from source by navigating to lang/ldc-devel in your ports tree

{{{
make install clean
}}}

This port was pulled straight from ldc and tango trunk, report any problems with the port to the maintainer.