Elie Roux <[log in to unmask]> wrote:

> \RequirePackage{ifluatex}
> \RequirePackage{iflxetex}
> \ifluatex
> \RequirePackage{luainputenc}
> \else
> \ifxetex
>   \RequirePackage{xetexinputenc}
> \else
>   \RequirePackage{legacyinputenc}
> \fi
> \fi

this doesn't work reliably: you need explicit \PassOptionsToPackage for
each option, before \RequirePackage.

(your code seems to work for just one option, but not for 2.  people do
use inputenc with >1 option...though i'm not certain it's sensible to do
so.)

something like

\def\RequirePackageWithOptions#1{%
  \DeclareOption*{\PassOptionsToPackage{\CurrentOption}{#1}}%
  \ProcessOptions
  \RequirePackage{#1}%
}

robin