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Date: Wed, 30 May 2012 23:08:10 +0200
From: Stephane Rouberol <rouberol@iap.fr>
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Subject: Building openmpi from src rpm: rpmbuild errors with 'cpio: MD5 sum
	mismatch' (since openmpi 1.4.5)
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Hi
Since 1.4.5 openmpi release, it is no longer possible to build openmpi 
binary with rpmbuild --rebuild if system rpm package version is 4.4.x, 
like in SLES10, SLES11, RHEL/CentOS 5.x.

For instance, on CentOS 5.8 with rpm 4.4.2.3-28.el5_8:

[root@horizon _tmp]# rpmbuild --rebuild openmpi-1.4.5-1.src.rpm
Installing openmpi-1.4.5-1.src.rpm
warning: user jsquyres does not exist - using root
error: unpacking of archive failed on file 
/usr/src/redhat/SPECS/openmpi-1.4.5.spec;4fc65c74: cpio: MD5 sum mismatch
error: openmpi-1.4.5-1.src.rpm cannot be installed

Apparently this problem is due to lack of support of SHA-256 in rpm 4.4.x

Googling suggests
   rpmbuild -bs \
    --define "_source_filedigest_algorithm md5" \
    --define "_binary_filedigest_algorithm md5" \
    package.spec
should be used to produce openmpi src rpms and avoid the problem.

Please note that
- rpmbuild works OK on RHEL/CentOS 5.x with openmpi-1.4.4-1.src.rpm and 
all previous versions
- rpmbuild works OK on with all openmpi versions with rpm 4.8.x from 
RHEL/CentOS 6.x
- I successfully tested 2 workarounds
1) install package with --nomd5, then rpmbuild -ba <specfile>
2) repackage with "old" rpm
rpm2cpio to extract spec file + sources tar
rpmbuild -bs <specfile> to produce new src rpm
Then rpmbuild --rebuild is OK

Regards,
Stephane Rouberol