Get "bad response from optimizer"

I’m trying to setup this plugin in a VPS with CentOS 6.6 but I can’t get it to work since I get “Bad response from optimizer” any time I try to optimize a image.

This are the steps I’ve followed (all the process was logged as root user):

* Install libraries:
# yum install gcc libpng libpng-devel gifsicle pngcrush p7zip lzip
* Download the latest littleutils version:
wget https://downloads.sourceforge.net/project/littleutils/littleutils-source/1.0.32/littleutils-1.0.32.tar.xz?r=http%3A%2F%2Fsourceforge.net%2Fprojects%2Flittleutils%2F
(Rename to littleutils-1.0.32.tar.xz cause it downloads as a weird extension)
* Uncompress the file:
tar xf littleutils-1.0.32.tar.xz and cd /littleutils-1.0.32
* Configure and compile using this parameters:
./configure --prefix=/usr && make && make install && make install-extra
* Check PATH:

echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

* Run this commands to create symbolic links:
ln -s /usr/local/bin/opt-jpg /usr/bin/opt-jpg && ln -s /usr/local/bin/opt-png /usr/bin/opt-png && ln -s /usr/local/bin/opt-gif /usr/bin/opt-gif && ln -s /usr/local/bin/tempname /usr/bin/tempname && ln -s /usr/local/bin/imagsize /usr/bin/imagsize && ln -s /usr/local/bin/gifsicle /usr/bin/gifsicle && ln -s /usr/local/bin/pngcrush /usr/bin/pngcrush && ln -s /usr/local/bin/pngrecolor /usr/bin/pngrecolor && ln -s /usr/local/bin/pngstrip /usr/bin/pngstrip

But plugin still not working and also it says that littleutils aren’t installed, did I miss something?

https://www.ads-software.com/plugins/cw-image-optimizer/