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From: Simon Wright <simon@pushface.org>
Newsgroups: comp.lang.ada
Subject: Re: Example Ada calling Gnu Scientific Library (GSL)
Date: Sun, 09 Apr 2017 16:17:47 +0100
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Date: 2017-04-09T16:17:47+01:00
List-Id: <comp.lang.ada>

hreba <f_hreba@yahoo.com.br> writes:

>    package Builder is
>       for Default_Switches ("C") use ("-lgsl");
>    end Builder;

Try

package Linker is
   for Default_Switches ("ada") use ("-lgsl");
end Linker;