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Hi!
I'm also quite new to this list (and gentoo programming). 
As far as I understood you, isn't this is what you're looking for:
IUSE="tcltk"
DEPEND="tcltk? ( dev-lang/tcl dev-lang/tk)"

src_compile() {
....
    use tcltk \
        && myopts="${myopts} --enable-tcl" \
        || myopts="${myopts} --disable-tcl"
        #Or whatever options should enable or disable it.
....
}

On Thursday 24 April 2003 10:20, Jens Hoffrichter wrote:

> The general ebuild is working, but the tool has several gui's, including
> a curses gui and a tk gui. But it does not really depends on Tk or curses,
> because it has fallback to other gui's which do not need specific
> libraries. But I can not really "deconfigure" the tk-gui or the curses gui,
> so the use of USE variables seems not to be correctly.
>
> To file a dependency against Tk does not seems right, as the package does
> not really depend on Tk, it just looks nicer. And how I should make use
> of the USE variable I'm not sure.
>
> So I'm asking if someone can guide me how I should mark the
> "soft-dependencies" in the tool.....
>
> CU all,
> Jens

- -- 
Sergey Kuleshov <sergey@...>
Studio Programer
Microsoft Certified Professional
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