Trying to install GCC on Fedora 22

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Hi guys/gals trying to learn assembly language with Programming from the Ground Up. This is the first time i've used Fedora and I'm trying to install GCC toolset. I've tried using a variety of commands but I always end up with this error

[jelliott@localhost ~]$ su -c "yum install gcc"

Password: Yum command has been deprecated, redirecting to '/usr/bin/dnf install gcc'. See 'man dnf' and 'man yum2dnf' for more information. To transfer transaction metadata from yum to DNF, run: 'dnf install python-dnf-plugins-extras-migrate && dnf-2 migrate'

Waiting for process with pid 1398 to finish.

After that it just sits there and won't respond.