Easy Spec file question

[Tom Diehl]

Hi,

I am trying to understand the following lines in a spec file.

The spec file is from the fedora postfix rpm and I would like to rebuild 
the rpm with mysql enabled. I think that I can simply change the first
line to say  %define MYSQL 1 but I am wondering if there is a parameter
I can pass from the rpmbuild command line so that I do not have to modify
the spec file.

Can someone please tell me how to get the srpm to build with mysql enabled
without modifying the spec?

%{?!MYSQL: %define MYSQL 1}
%{?!PGSQL: %define PGSQL 0}
%define LDAP 2
%define PCRE 1
%define SASL 2


Regards,

-- 
Tom Diehl		tdiehl at rogueind.com		Spamtrap address mtd123 at rogueind.com