RPM constructed name - how to control?

I've been trying to build an RPM on an AIX system and I'm running into a silly little issue - the AIX rpm insists on putting 'aix5.3' onto the RPM name, even if I build it with BuildArch: noarch
 
If I take the same spec file and put it on a RHEL system and build it there - it works fine.  So my question is - is there some spec file way of saying what the actual RPM name should end up looking like?  I've tried building with --target but that didn't help.  Should I be unsetting some tag to make aix 5.3 go away?
 
AIX builds: facter-1.3.8-4.aix5.3.noarch.rpm
RHEL builds: facter-1.3.8-4.noarch.rpm
 
The RPM version on AIX is older, but it's what IBM provides,
[stha3155@nickel1:~/rpm]$ rpm --version
RPM version 3.0.5

RHEL:
[[email protected]:~/rpm/SPECS]$ rpm --version
RPM version 4.4.2
 
I've tried search the rc for any 'aix' strings:
 
[stha3155@nickel1:~/rpm]$ rpm --showrc | grep aix
build os              : aix5.3
compatible build os's : aix5.3
install os            : aix5.3
compatible os's       : aix5.3 aix5.2 aix5.1 aix5.0 aix4.3
macrofiles            : /opt/freeware/lib/rpm/macros:/opt/freeware/lib/rpm/ppc-aix5.3/macros:/etc/rpm/macros.specspo:/etc/rpm/macros:/etc/rpm/ppc-aix5.3/macros:~/.rpmmacros
-14: _host      powerpc-ibm-aix5.1
-14: _host_alias        powerpc-ibm-aix5.1
-14: _host_os   aix5.1
-14: _os        aix
-11: _target    ppc-aix5.3
-11= _target_os aix5.3

Obviously, since I'm building 'noarch' packages, I can build them on the RHEL system and be done with it - this is more of a curiosity than anything.
 
Here's the spec file ( any comments on other parts of this spec file are welcome as well )
 
%define rubylibdir %(ruby -rrbconfig -e 'puts Config::CONFIG["sitelibdir"]')
%define rubybindir %(ruby -rrbconfig -e 'puts Config::CONFIG["bindir"]')
 
Name: facter
Version: 1.3.8
Release: 4
Packager: %{packager}
Vendor: %{vendor}
Summary: facter is a small ruby program that gets facts about your system
License: GPL
Group: Applications/System
Source0: facter-1.3.8.tgz
BuildRoot: %{_tmppath}/%{name}-%{version}-%{release}-root
BuildArchitectures: noarch
 
Requires: ruby >= 1.8.1
BuildRequires: ruby >= 1.8.1
 
Prefix: %{rubybindir}
Prefix: %{rubylibdir}
 
%description
Facter is a module for collecting simple facts about a host Operating system. It is required for Puppet.
 
%prep
%setup -q
 
%build
 
%install
rm -rf %{buildroot}
mkdir %{buildroot}
DESTDIR=%{buildroot} ruby ./install.rb
 
%clean
rm -rf %{buildroot}
 
%files
%defattr(-,root,root,-)
%{rubybindir}/facter
%{rubylibdir}/*
 
%changelog
* Tue May 8 2008 Steve 'haji' Hajducko <[email protected]> - 1.3.8-4
- Added rubybindir - facter will be installed by default to this directory.  Also added
  Prefix methods to allow for different install location
 
* Tue May 6 2008 Steve 'haji' Hajducko <[email protected]> - 1.3.8-3
- Changed file listing to include rubylibdir and bindir
 
* Tue May 6 2008 Steve 'haji' Hajducko <[email protected]> - 1.3.8-2
- Added file listing
 
* Tue May 6 2008 Steve 'haji' Hajducko <[email protected]> - 1.3.8-1
- Initial spec file

 
.....................................................................
Steven Hajducko
Systems Engineer, Systems Integration
w: 818.597.6443   m: 805.377.9074
  

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