Before generating the Tango manual with lyx, copy the layout files 
to the following directories in your home directory:

cp layouts/Tango_book.layout  ~/.lyx/layouts/Tango_book.layout
cp layouts/Tango_book.cls  ~/.TeX/Tango_book.cls

In the case of an latex error as:
	missing tex class Tango_book
you might have to use the TEXINPUTS environment variable
to indicate where to find the Tango_book.cls file.
	export TEXINPUTS=$TEXINPUTS:~/.TeX

Once all this is done, lyx (in graphic mode) and reconfigure it (Tool/Reconfigure) and quit it

To generate the Tango doc, simply type

	lyx -e pdf tango.lyx
