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Newsgroups: comp.lang.ada
Date: Fri, 29 Apr 2022 21:30:48 -0700 (PDT)
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Subject: Re: Trouble building with gnatcoll
From: John Perry <devotus@yahoo.com>
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Xref: reader02.eternal-september.org comp.lang.ada:63785
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I found the answer, and it's a bit embarrassing, but looking in the gnatcoll examples would have done it: add

   with "gnatcoll";

to the beginning of the gpr file.