Re: [gentoo-dev] Using LINGUAS

[Jeroen Roovers <jer@gentoo.org>]

On Mon, 21 Jul 2014 13:23:46 +0900
Thomas Kahle <tomka@gentoo.org> wrote:

> the OCR software tesseract has many different plugins for
> language packs used for OCR for different languages.  The ebuild
> uses the LINGUAS variable to pass the choice of which packages to
> install to the user.

Every ebuild uses LINGUAS implicitly. What you mean is that you
expand LINGUAS to USE Flags...

> A reverse dependency is app-text/pdfsandwich which roughly puts
> OCR'ed text in a scanned pdf.  Since it uses tesseract it
> supports exactly those languages that tesseract supports.
> 
> Should its ebuild have LINGUAS use flags and then depend on
> tesseract with at least those flags set?

... in which case you can simply use USE dependencies since you have
USE-expanded flags matching LINGUAS. It should be easy to match one
ebuild's IUSE with another's.

linguas_tlh? ( app-text/tesseract[linguas_tlh] )


     jer