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From: John McCabe <john@nospam.mccabe.org.uk.nospam>
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Subject: Re: unknown error mesage
Date: Tue, 16 Mar 2021 18:21:15 +0000
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On Tue, 16 Mar 2021 18:49:21 +0100, ldries46 <bertus.dries@planet.nl>
wrote:

>During debugging an Ada program when building a new version I got the 
>following message:
>
>gprbuild -d -PD:\ada\project\Datum\Datum.gpr -j8
>Bind
>    [gprbind]      datum.bexch
>    [Ada]          datum.ali
>fatal error: file gtk.ali is incorrectly formatted
>make sure you are using consistent versions of gcc/gnatbind
>56.  G a e
>       |
>gprbind: invocation of gnatbind failed
>gprbuild: unable to bind datum.adb
>[2021-03-16 18:40:50] process exited with status 4, 100% (63/63), 
>elapsed time: 02.63s
>
>I have already deleted all .ali files in the build directory, deleted 
>the Datum.exe file, reinstalled GtkAda en even reinstalled GNAT Studio 
>Community version 2020.
>
>Who can tell me what is message means and how to eliminate that

I presume you've read this question with a similar issue? 

https://stackoverflow.com/questions/7576994/ada-strange-error-consistent-version-of-gcc-gnatbind

The suggestion from that would appear to be that your gtk may have
been built with a different version of GNAT, hence you might need to
recompile the GtkAda library with whatever version of GNAT you've now
got.

However, did you download the GtkAda version matching the GNAT
Community version from here - https://www.adacore.com/download/more?