[csw-maintainers] GAR: EXTRA_TEXINFO documentation

[pfelecan at opencsw.org]

How can I add texinfo files to be considered in cswtexinfo when their name
doesn't correspond to the TEXINFO pattern?

Reading the gar.pkg.mk I understand that the EXTRA_TEXINFO provides
additional texinfo files to consider. But the EXTRA_TEXINFO GAR variable
is not documented...

In addition, how can I specify that the additional texinfo files are
specific to a sub-package?

Can somebody reveal the knowledge arround this and document it in 
https://sourceforge.net/apps/trac/gar/wiki/GAR%20Variable%20Reference ?

TIA