title: QUEX_PATH issue while using tokenizer
body: <p>I'm trying to install trainable-tokenizer. I have installed all the dependencies as per the README. this is trainable-tokenizer <a href="https://github.com/jirkamarsik/trainable-tokenizer" rel="nofollow">https://github.com/jirkamarsik/trainable-tokenizer</a>. i have installed quex.deb using installer from quex.org which is a dependency for trainable-tokenizer. </p>
  
  <p>when i try to do <code>sudo make install</code> i get the following error</p>
  
  <pre><code>ThinkPad-T430:~/tmp/OpenFST/tokenizer/trainable-tokenizer/src$ sudo make install 
  [  6%] Building FeaturesReader with quex
  Environment variable QUEX_PATH has not been defined.
  error: environment variable 'QUEX_PATH' is not defined.
  error: your system is 'posix'.
  error: if you are using bash-shell, append the following line
  error: to your '~/.bashrc' file:
  error:
  error: export QUEX_PATH=directory-where-quex-has-been-installed
  make[2]: *** [quex_files/trtok_read_features_FeaturesReader] Error 255
  make[1]: *** [CMakeFiles/trtok.dir/all] Error 2
  make: *** [all] Error 2
  </code></pre>
  
  <p>but i have already set up the QUEX_PATH. </p>
  
  <pre><code>ThinkPad-T430:~/tmp/OpenFST/tokenizer/trainable-tokenizer/src$ echo $QUEX_PATH 
  /opt/quex/quex-0.65.4/
  ThinkPad-T430:~/tmp/OpenFST/tokenizer/trainable-tokenizer/src$ ll /opt/quex/quex-0.65.4/
  total 68
  drwxrwxr-x 5 root root  4096 May 25 17:42 ./
  drwxrwxr-x 3 root root  4096 May 25 17:42 ../
  -rw-r--r-- 1 root root   181 Oct 13  2013 COPYRIGHT.txt
  drwxr-xr-x 5 root root  4096 May 25 17:42 demo/
  -rw-r--r-- 1 root root     0 Feb 26 02:01 __init__.py
  -rwxr-xr-x 1 root root 26424 Oct 13  2013 LGPL.txt*
  drwxr-xr-x 2 root root  4096 May 25 17:42 manpage/
  drwxr-xr-x 6 root root  4096 May 25 18:02 quex/
  -rw-r--r-- 1 root root  3098 Oct 13  2013 quex.bat
  -rwxrwxr-x 1 root root  2649 Feb 26 02:01 quex-exe.py*
  -rw-r--r-- 1 root root  4074 Oct 13  2013 README
  -rw-rw-r-- 1 root root   118 Mar 22 15:22 unit_test_results.txt
  </code></pre>
  
  <p>i also added <code>export QUEX_PATH=/opt/quex/quex-0.65.4/</code> to the <code>.bashrc</code></p>
  
  <pre><code>ThinkPad-T430:~/tmp/OpenFST/tokenizer/trainable-tokenizer/src$ vim ~/.bashrc
  ThinkPad-T430:~/tmp/OpenFST/tokenizer/trainable-tokenizer/src$ echo $QUEX_PATH 
  /opt/quex/quex-0.65.4/
  ThinkPad-T430:~/tmp/OpenFST/tokenizer/trainable-tokenizer/src$ sudo make install
  [  6%] Building FeaturesReader with quex
  Environment variable QUEX_PATH has not been defined.
  error: environment variable 'QUEX_PATH' is not defined.
  error: your system is 'posix'.
  </code></pre>
  
  <p>but still i get the same error.</p>