In general the iconv SPKG is not even required. It's not installed (or rather, a dummy empty package is installed) for any platforms except Cygwin, HP-UX, and Solaris.

The requirement for it on Cygwin is probably outdated--iconv is a standard library on almost all Cygwin installations, and is surely more up-to-date than when this SPKG was first added in #8567. Support for the other two platforms has not been maintained much.

We can add a configure-time check for it, and treat it as a dummy package in most cases.

CC: @orlitzky @slel

Component: build: configure

Author: Dima Pasechnik, Erik Bray

Branch: 2b5ceb1

Reviewer: Erik Bray, Dima Pasechnik

Issue created by migration from https://trac.sagemath.org/ticket/27823