Install time expansion of macros

["Christian Goetze" <cg hq addamark com>]

Here's a little problem that I was wondering about and is somewhat of an
expansion upon relocation.

In the spec file, I would like to be able to say something like:

VERSION = 1.1

%dir /usr/lib/foo/%{VERSION}
...
/etc/foo/%{VERSION}/foo.conf

and then, at install time, be able to override this, for example by saying:

"rpm -i foo.rpm VERSION=1.1patched".

The reason for this is to allow me to install the same version of an RPM
onto some system where a vital, but flawed (via out of band mods, for
example) and nominally identical version of the same package exists.

Generally, I think that this method for doing relocatable packages would
be nice to have. "pkgadd" supports this type of installtime expansion...
--
cg