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Newsgroups: comp.lang.ada
Date: Fri, 24 Jan 2014 03:47:20 -0800 (PST)
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Subject: Re: project file GPS, and  for Source_List_File use "xxx.txt";
From: thymallus1@free.fr
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Xref: news.eternal-september.org comp.lang.ada:18284
Date: 2014-01-24T03:47:20-08:00
List-Id: <comp.lang.ada>

The 's' is not a typo, I just wanted to mean "the directory containing the source files"(whose name is "Sources").
If instead of GPS I invoke directly gnatmake: 
gnatmake -PRTS3-GW rts3_gw.adb I obtain also "file gw-source_files.txt not found".
Same thing if I suppress the external parentheses.
So the problem should be with the project file...