This ticket adds an spkg-configure.m4 for giac, in order to use it from a system package if possible.

https://repology.org/project/giac/versions

See also:

• Upgrade giac to 1.6.0-47 #30537 Upgrade giac to 1.6.0-7

CC: @dimpase @orlitzky @kiwifb @frederichan-IMJPRG @sagetrac-parisse @sheerluck @antonio-rojas @kliem @tobihan

Component: build: configure

Keywords: spkg-configure giac

Author: Thierry Thomas, Matthias Koeppe

Branch/Commit: 0df15df

Reviewer: Isuru Fernando

Issue created by migration from https://trac.sagemath.org/ticket/29541