Package: rxvt-unicode-256color-ml

"rxvt-unicode-256color-ml" package binaries on CentOS:

/usr/bin/urxvt256c-mlc /usr/bin/urxvt256c-ml /usr/bin/urxvt256c-mld

You may install this package on CentOS with yum install rxvt-unicode-256color-ml