Hi guys,

I previously reported that RPM building failed after the upgrade because 
of changes to macros.

I've just discovered another problem: after the upgrade, binary payloads 
are compressed with xz (instead of gzip) and file digests use SHA-256 by 
default, instead of MD5.

The issue with this is that now rpm packages will be incompatible with 
SL-5 machines: such packages require the "rpmlib(FileDigests)" and 
"rpmlib(PayloadIsXz)" capabilities, which SL-5 rpm doesn't provide.

The work-around is to specify the desired compression and hash algorithm 
explicitly.  These can be placed in a configuration file (e.g., 
~/.rpmmacros), provided on the rpmbuild command-line or embedded within 
the spec file:

     %define _source_payload w9.gzdio
     %define _binary_payload w9.gzdio
     %define _source_filedigest_algorithm 1
     %define _binary_filedigest_algorithm 1

This problem was caused by the rpm introducing a new dependency: 
redhat-rpm-config.

Cheers,

Paul.