On Fedora 13 or later you can install the LDC package using your package manager (search for 'ldc') or use the command line

From official repo

yum install ldc

To install the Tango library, do:

yum install tango-devel

From unofficial repo

They are here some unofficial repos for D programming: http://repos.fedorapeople.org/

D repo advantage:

* follow upstream
* more D package

To do:

$ su -
# cd /etc/yum.repos.d/
# urlgrabber http://repos.fedorapeople.org/repos/bioinfornatics/D/fedora-D.repo
# yum install ldc tango-devel

enjoy :)