Compiling project in c/c++ - Missing steps while downloading.

Hi guys !
I'm running on my PC Ubuntu Linux , and what I'm trying to run project of decoder that's called Viterbi decoder from this website:
http://www.eccpage.com/

Under Viterbi decoder line there's a file called :
viterbi-3.0.1.tar

I've downloaded it and extracted it in my directory, Im trying to compile and it's not compiling at all, it tells me files isn't on the directory.

The file viterbi-3.0.1.tar has readme and make files and I've read them but I couldn't succeed to compile, could anyone please help me how do I compile this project successfully?

As I believe that the code doesn't have any software error/buys and it should work fine .... so I deeply believe that the error isn't compiling/downloading it correctly in my linux .. any help?
I did in my linux on the extracted file this:
$make
$./viterbi
and it didn't give me any output and gives me errors that file missing and file isn't found on directory !

All I need is to compile it right and to write correct instructions in linux in order to compile it correctly.

Any help guys? thanks alot for your cooperation in this.
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