Compiling GIMP Beautify Plug-in on GNU/Linux:
Make sure you have at least 2 GB of free space on /home.
Install "git" in your distribution. Also install the development libraries for the GIMP (libgimp2.0-dev on Ubuntu). I guess you also need the headers and basic build tools for your distribution.
Open the terminal and download the sources from GitHub:
git clone https://github.com/hejiann/beautify
When the download is complete enter to the directory:
On my computer (and Kubuntu 64bits) this has overloaded my CPU and that it took a while.
Install on your /home/USER/.gimp-2.8/plug-ins/:
You must have these binary files in your /home/USER/.gimp-2.8/plug-ins/:
and verify that each one is executable.
You can find the plugin in "Filters" > "Beautify".
Thanks Rod for notice about this plug-in