title: How to set a directory in PKG_CONFIG_PATH variable in ubuntu
body: <p>I want to add a directory containing a .pc file, to the PKG_CONFIG_PATH variable, that is required for a certain program to run on Ubuntu. I tried to find out a solution from google but it didn't really work. </p>
  
  <p>I am pasting the log here. Please help.</p>
  
  <pre><code>tasbeer@tasbeer-desktop:~/Android/pocketsphinx/swig$ make
  cc -g -Wall -DPIC -fPIC -I/usr/lib/jvm/default-java/include `pkg-config
  --cflags sphinxbase pocketsphinx`  -c -o pocketsphinx_wrap.o
  pocketsphinx_wrap.c
  **Package sphinxbase was not found in the pkg-config search path.
  Perhaps you should add the directory containing `sphinxbase.pc'
  to the PKG_CONFIG_PATH environment variable
  No package 'sphinxbase' found
  Package pocketsphinx was not found in the pkg-config search path.
  Perhaps you should add the directory containing `pocketsphinx.pc'
  to the PKG_CONFIG_PATH environment variable
  No package 'pocketsphinx' found**
  </code></pre>