Install lessc on your server (Debian)

# get root
su root
cd ~


# Download latest version of node.js
# please replace the url with the newest available version, which you can find here http://nodejs.org/#download
wget http://nodejs.org/dist/node-v0.4.7.tar.gz

# extract node.js install package
tar xfvz node-v0.4.7.tar.gz

# change working directory
cd node-v0.4.7


# configure
./configure

# compile it
make -j4

# install it
make install


# go back to home
cd ~


# download less
wget --no-check-certificate https://github.com/cloudhead/less.js/tarball/master


# extract
tar xfvz cloudhead-less.js-v1.0-336-g853604a.tar.gz


mv cloudhead-less.js-853604a lesscss
mv lesscss/ /usr/local/



cd /usr/local/bin/
ln -s ../lesscss/bin/lessc



/******************** NOTES *****************/
When you run "./configure" you might get an error that no g++,c++... compiler is available.
You can run "apt-get install build-essential" to solve this.

If you get an error that no openSSL is not available you can either configure it without them (--without-ssl) or you can install libssl by running:
apt-get install libssl-dev