Seems someone has already applied this.
>
> Please find attached a patch for the pg_dump directory which addresses:
>
> - The problems Jan reported
>
> - incompatibility with configure (now uses HAVE_LIBZ instead of HAVE_ZLIB)
>
> - a problem in auto-detecting archive file format on piped archives
>
[ Attachment, skipping... ]
>
> ----------------------------------------------------------------
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