[Fedora-packaging] Multiline %defines

[Ralf Corsepius]

Hi,

Is there a portable (portable across different versions of rpm)
way to override specify defines which span across several lines, from
inside of a spec file?

Background: I am trying to override __os_install_post from inside of a
spec file, similar to this:
..
%define __os_install_post \
        ./brp-custom-compress \
        ./brp-custom-strip \
%{nil}
..
This seems to work on rpm-4.4.x (FC4), but seems to fail with 
rpm-4.0.x (rh7.3):

# rpmbuild tmp.spec
....
error: Macro %__os_install_post has empty body
error: line 55: Unknown tag:   ./brp-compress \

AFAIS, rpm-4.0.x chokes on the line continuation char.

Ralf