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From: Simon Wright <simon@pushface.org>
Newsgroups: comp.lang.ada
Subject: Re: Mathpaqs release 13-Mar-2018
Date: Fri, 16 Mar 2018 17:54:37 +0000
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Date: 2018-03-16T17:54:37+00:00
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"Vincent D." <vincent.diemunsch@gmail.com> writes:

> Therefore I downloaded the file : zipada53.zip and tried to build
> unzipada but it failed on OS X with the following error message :
>  > ld: library not found for -lwin32ada
>  > collect2: error: ld returned 1 exit status
>  > gprbuild: link of unzipada.adb failed
>
> How can I build unzipada under OS X ?

zipada.txt says

  UnZipAda uses a procedure from an extension to Ada.Directories for
  setting time stamps of extracted files.
  
  This extension in its turn uses a system-specific call.
  
  You can replace the call to Set_Modification_Time by null and remove
  the line with Ada_Directories_Extensions to get a totally portable
  tool using only Zip-Ada and Ada standard libraries.

Then built OK for me with

  $ gprbuild -p -XBuild_Mode=Debug unzipada.adb

(the default is Fast, and that uses the linker flag -gc-sections, which
macOS's ld doesn't understand, it's a GNU ld facility.)

Unfortunately the resulting tool only printed out its help message ...