For repository information for all versions of ARC and Fedora, please visit official NorduGrid download site.
rpm --import http://download.nordugrid.org/RPM-GPG-KEY-nordugrid
Globus certificate utilities are needed if you need to request a Grid certificate. These utilities are available from official Fedora repositories since Fedora 9.
yum install globus-gsi-cert-utils-progs
Then you'd need keys of potentially relevant Certification Authorities. Get them either from the official NorduGrid download site (see "External software", IGTF), or directly from IGTF:
wget http://dist.eugridpma.info/distribution/current/igtf-policy-installation-bundle-1.40.tar.gz tar xvzf igtf-policy-installation-bundle-1.40.tar.gz cd igtf-policy-installation-bundle-1.40 ./configure --with-profile=classic make install
You may need to browse to that repository first and find out what is the most recent version number, instead of 1.40
Then install ARC client itself, which will pull in other necessary packages (Globus plugins need to be requested explicitly):
yum install nordugrid-arc-client nordugrid-arc-plugins-globus