[eebrah@localhost ~]$ su -c 'yum install jack-audio-connection-kit'
Password:
Loaded plugins: fastestmirror, langpacks, refresh-packagekit
https://copr-be.cloud.fedoraproject.org/results/stransky/FirefoxGtk3/fedora-20-i386/repodata/repomd.xml: [Errno 14] curl#60 - "Peer's certificate issuer has been marked as not trusted by the user."
Trying other mirror.
Loading mirror speeds from cached hostfile
 * fedora: ftp.sun.ac.za
 * rpmfusion-free: mir01.syntis.net
 * rpmfusion-free-updates: mir01.syntis.net
 * rpmfusion-nonfree: mir01.syntis.net
 * rpmfusion-nonfree-updates: mir01.syntis.net
 * updates: mir01.syntis.net
Resolving Dependencies
--> Running transaction check
---> Package jack-audio-connection-kit.i686 0:1.9.9.5-3.fc20 will be installed
--> Finished Dependency Resolution

Dependencies Resolved

================================================================================
 Package                        Arch      Version             Repository   Size
================================================================================
Installing:
 jack-audio-connection-kit      i686      1.9.9.5-3.fc20      fedora      542 k

Transaction Summary
================================================================================
Install  1 Package

Total download size: 542 k
Installed size: 2.0 M
Is this ok [y/d/N]: y
Downloading packages:
jack-audio-connection-kit-1.9.9.5-3.fc20.i686.rpm          | 542 kB   00:11
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
error: %pre(jack-audio-connection-kit-1.9.9.5-3.fc20.i686) scriptlet failed, exit status 127
Error in PREIN scriptlet in rpm package jack-audio-connection-kit-1.9.9.5-3.fc20.i686
  Verifying  : jack-audio-connection-kit-1.9.9.5-3.fc20.i686                1/1

Failed:
  jack-audio-connection-kit.i686 0:1.9.9.5-3.fc20