Install is simple, you need to setup and properly configure alsa, then you can just build and run pocketsphinx
sudo apt-get update
sudo apt-get upgrade
cat /proc/asound/cards
check your microphone is visible or not and if on which usb extension
sudo nano /etc/modprobe.d/alsa-base.conf
Now change this
# Keep snd-usb-audio from being loaded as first soundcard
options snd-usb-audio index=-2
To options snd-usb-audio index=0
if there is some other options snd-usb-audio index=1, comment it out
sudo reboot
cat /proc/asound/cards
check your device is at 0
sudo apt-get install bison
sudo apt-get install libasound2-dev
download sphinxbase latest , extract
./configure --enable-fixed
make
sudo make install
download pocketsphinx, extract
./configure
make
sudo make install
export LD_LIBRARY_PATH=/usr/local/lib
export PKG_CONFIG_PATH=/usr/local/lib/pkgconfig
Run it, should work
pocketsphinx_continuous -inmic yes