James schrieb:
> Hello,
> 
> 
> I need to be able to find which packages use a particular flag.
> 
> "gpac" to be specific:
> 
> Enable GPAC support when exporting to 3GPP format.
> 
> 
> Any simple/global tools to find and list each and every
> package available on Gentoo that has this flag as a option?
> 
> 
> There is also an ebuild named "gpac"
> 
> Kino is one package the has this "gpac" flag.
> How so I know it is the only one that requires
> this gpac flag?
> 
> James
> 
> 
> 
> 
> 
You can use

equery hasuse gpac ==> shows all install packages which have

or

qgrep -v IUSE|grep gpac ==> extensive but should bring you all packages which have it in USE