There is a short paragraph about it here:
http://ibphoenix.com/main.nfs?a=ibphoenix&page=ibp_download_15


--- In firebird-support@yahoogroups.com, "vs_20100" <vschmid@p...>
wrote:

>
> Hi,
>
> I'm installing Firebird 1.5 on Linux for the first time. I do not
> understand what NPTL is, nor when I should use the NPTL version

and

> when I should use the other one.
>
> - Which one is the best for RedHat 9 ?
> - Any good link about POSIX and NPTL "for newbie" would be
> appreciated.
>
> Best regards,
> Vincent