Mixxx On Fedora
Mixxx is not available directly from Fedora because Mixxx statically links to libmad in order to support mp3 files.
Fedora is unable to include encoding and decoding support for the MP3 format because it requires patented technologies and the patent holder has not provided licenses that are compatible with Fedora's requirements source
Instead Mixxx is available from RPM Fusion.
Enable RPM Fusion using the instructions here:
http://rpmfusion.org/Configuration
Then run:
su -c 'yum install mixxx'
This is the Mixxx Wiki - 
Mixxx is a free and open-source DJ software.
Manual
Hardware Compatibility
Reporting Bugs
Getting Involved
Contribution Guidelines
Coding Guidelines
Using Git
Developer Guide
Creating Skins
Contributing Mappings
Mixxx Controls
MIDI Scripting
Components JS
HID Scripting