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Unfortunately the pocketsphinx package which is mentioned in the ROS wiki was developed back in 2011. It is no longer recommended to use GStreamer with pocketsphinx.
You should instead use this package:
https://github.com/cmusphinx/ros-pocketsphinx
It has most of the up-to-date features of pocketsphinx, and a great wiki can be found in the parent repository:
https://github.com/Pankaj-Baranwal/cmu-pocketsphinx/wiki
It will walk you through the installation and demonstration of the basic working of the package.
This will help you get the same functionalities as provided by the 2011 package by MikeFerguson and set it up on any linux system with ease!