Here we will answer on frequently asked questions.

1. LESSC compiler is not available on path

Curently, due to historical reasons we still use Less CSS for some of our stylesheets. It was default stylesheets compiler for Odoo versions <= 11.0. After Odoo 12.0 released, the default stylesheet compiler is Sass Lang (SCSS), but old Less CSS is still supported by Odoo. The only inconvenient thing is that Less CSS after Odoo 12.0 is not installed by default, so you have to install it manually.

To Install Less CSS, you can use installation instruction for Odoo 11.0 (look for Less CSS via nodejs section). The content of this section is below:

• on Linux, use your distribution’s package manager to install nodejs and npm.

  Warning

  In debian wheezy and Ubuntu 13.10 and before you need to install nodejs manually:

  $ wget -qO- https://deb.nodesource.com/setup | bash -
  $ apt-get install -y nodejs
  

  In later debian (>jessie) and ubuntu (>14.04) you may need to add a symlink as npm packages call node but debian calls the binary nodejs

  $ apt-get install -y npm
  $ sudo ln -s /usr/bin/nodejs /usr/bin/node
  

  Once npm is installed, use it to install less:

  $ sudo npm install -g less
  

• on OS X, install nodejs via your preferred package manager (homebrew, macports) then install less:

  $ sudo npm install -g less
  

• on Windows, install nodejs, reboot (to update the PATH) and install less:

  C:\> npm install -g less

Also, if you use CRND Deploy project to install Odoo, then you will get Less CSS (and other dependencies) installed automatically.