Expanding a Macro during install ???

[Lakshmi V <lakshmi granger gmail com>]

Hi all

I have got a macro in my spec file

%{!?myloc: %{expand: %%define myloc loc1}}

I am using this in my %install section 

mkdir -p $RPM_BUILD_ROOT/scratch/%{myloc}
cp /scratch/tmp/readme.txt $RPM_BUILD_ROOT/scratch/%{myloc}/read_me.txt
chmod 777 $RPM_BUILD_ROOT/scratch/%{myloc}/read_me.txt

Now while buiding if I give 
rpmbuild -ba myspec.spec --define 'myloc loc2' 
it replaces the myloc correctly and the rpm is built with
/scratch/loc2/read_me.txt entries, but when I want to do the same thing
during install, it doesnt respond to the --define part at all. Will the
--define not work with rpm -ivh ? because the rpm is already built with
the myloc substituted with loc2 ? 

Is there any workaround ?

Thanks
Lakshmi