release version using c_cnt and b_cnt

[sbarbereau]

Hello,
I've the feeling I must be missing something simple here but googling and look on forum and ML archive didnt gave me a clear answer.
I would like the Release field from my spec file to be based on the osc build count and commit count. From what i do understand this should be the default behavior but it doesnt seem to be in my packages.
Example spec file header I'm using:
======
Name: iperf
Version: 2.0.4
Release: 3%{?dist}
Summary: Measurement tool for TCP/UDP bandwidth performance
License: BSD
Group: Applications/Internet
URL: http://iperf.sourceforge.net
Source: http://prdownloads.sourceforge.net/iperf/%{name}-%{version}.tar.gz
Patch0: iperf-2.0.4-debuginfo.patch
Patch1: iperf-2.0.4-tcpdual.patch
BuildRoot: %{_tmppath}/%{name}-%{version}-%{release}-root-%(%{__id_u} -n)
======
I tryed different variations of 'release' fields: "Release: 3","Release: <C_CNT>",no release line .... obvisouly none of it gives me the expected result.

I'm sure it must be very simple to get it to work as it should but if something can give me a hint on what to do I would appreciate.

Thanks,
Seb.