how to know if a rpm has support for something

[Barry Brimer]

Quoting ESGLinux <esggrupos at gmail.com>:

> Hello,
>
> I have a general question and a particular question.
>
> I begin with the particular question. I want to know if this rpm:
> rpm -qi postfix
> Name        : postfix                      Relocations: (not relocatable)
> Version     : 2.3.3                             Vendor: Red Hat, Inc.
> Release     : 2.1.el5_2                     Build Date: lun 11 ago 2008
> 13:45:07 CEST
> Install Date: mar 12 may 2009 14:02:17 CEST      Build Host:
> hs20-bc2-2.build.redhat.com
> Group       : System Environment/Daemons    Source RPM:
> postfix-2.3.3-2.1.el5_2.src.rpm
> Size        : 8332580                          License: IBM Public License
> Signature   : DSA/SHA1, jue 14 ago 2008 16:51:20 CEST, Key ID
> 5326810137017186
> Packager    : Red Hat, Inc. <http://bugzilla.redhat.com/bugzilla>
> URL         : http://www.postfix.org
> Summary     : Agente de Transporte de Correo Postfix
> Description :
> Postfix es un Agente de Transporte de Correo (MTA), que soporta LDAP,
> SMTP AUTH (SASL), TLS
>
> has mysql and quota support.
>
> and in general, how can I see how was compiled a rpm to know what  it is
> built on it and what not. ?


You need the spec file from the source RPM.