Need help with rpmbuild

[Steve Blackwell]

Specifically the install section. I'm not understanding how the
%install section works with the %files section.
I hope this is not considered OT.

Let's say I want my rpm to install the file "hello"
in /tmp on a target system. The %prep and %build sections work OK and
create my hello file in BUILD/hello-1. (Why BUILD/hello-1 and not just
BUILD I don't know but for now it doesn't matter.)

The install and files sections of my spec file look like this:
(Obviously %{name} is defined as hello)

%install
cp %{name} $RPM_BUILD_ROOT/

%files
%defattr(-,root,root,-)
/tmp/hello

%BuildRoot is defined (by default) to be
%(mktemp -ud %{_tmppath}/%{name}-%{version}-%{release}-XXXXXX)

What's with the XXXXX?
The cp works as expected but then an error occurs saying:

Extracting debug info ... blah ... blah...
...
error: File not
found: /home/steve/rpmbuild/BUILDROOT/hello-1-1.fc12.i386/tmp/hello

I feel like I'm missing the big picture here. 
I'd appreciate any direct help or pointers to some good explanation.
I've read a bunch of docs but they have not helped in this case.

Thanks,
Steve

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