What does "%if 0%{?..." mean

[Jos Vos]

On Sat, Jan 17, 2009 at 10:42:32PM -0800, Jonathan Ryshpan wrote:

> I surmise from this that 
> 	%if 0%{?build_jack_svn}
> is *always* true, since 
> 	0%{?build_jack_svn}
> always has a value.

If "0%{?build_jack_svn}" expands to "0" (if %{build_jack_svn} is not
defined) or "00" (if %{build_jack_svn} is defined as "0"), the %if
is evaluated as "false" as the numeric value is zero.

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