+The base source RPMs were downloaded from:
+ftp://ftp.pbone.net/mirror/olea.org/paquetes-rpm/perl-XML-LibXML-XPathContext-0.07-1.src.rpm
+ftp://ftp.sunet.se/pub/Linux/distributions/Mandriva/devel/cooker/SRPMS/contrib/release/perl-MARC-Record-2.0.2-1mdv2010.1.src.rpm
+ftp://mirror.switch.ch/pool/2/mirror/fedora/linux/development/rawhide/source/SRPMS/perl-HTML-TagCloud-0.34-4.fc14.src.rpm
+and are saved in the "orig" subdirectory.
+
+But they all needed tweaking for CentOS as shown in the log below:
+
+--
+
+$ sudo rpmbuild --rebuild perl-MARC-Record-2.0.2-1mdv2010.1.src.rpm
+Installing perl-MARC-Record-2.0.2-1mdv2010.1.src.rpm
+warning: InstallSourcePackage: Header V3 DSA signature: NOKEY, key ID 26752624
+warning: user mandrake does not exist - using root
+warning: group mandrake does not exist - using root
+warning: user mandrake does not exist - using root
+warning: group mandrake does not exist - using root
+error: line 8: Tag takes single token only: Release: %mkrel 1
+
+$ sudo rpmbuild --rebuild perl-XML-LibXML-XPathContext-0.07-1.src.rpm
+Installing perl-XML-LibXML-XPathContext-0.07-1.src.rpm
+warning: InstallSourcePackage: Header V3 DSA signature: NOKEY, key ID 41d6b379
+warning: user olea does not exist - using root
+warning: group olea does not exist - using root
+warning: user olea does not exist - using root
+warning: group olea does not exist - using root
+error: No compatible architectures found for build
+
+$ sudo rpmbuild --rebuild perl-HTML-TagCloud-0.34-4.fc14.src.rpm
+Installing perl-HTML-TagCloud-0.34-4.fc14.src.rpm
+warning: user mockbuild does not exist - using root
+warning: group mockbuild does not exist - using root
+error: unpacking of archive failed on file /usr/src/redhat/SOURCES/HTML-TagCloud-0.34.tar.gz;4c3c5fa4: cpio: MD5 sum mismatch
+error: perl-HTML-TagCloud-0.34-4.fc14.src.rpm cannot be installed
+
+--
+
+I couldn't find a source RPM for XML::LibXML::Simple, but I did find a
+"nosrc" RPM containing a .spec file, and the actual source is easy to
+get from CPAN, so I downloaded these from:
+http://dist.momonga-linux.org/pub/momonga/6/Everything/SRPMS/perl-XML-LibXML-Simple-0.13-3m.mo6.nosrc.rpm
+http://search.cpan.org/CPAN/authors/id/M/MA/MARKOV/XML-LibXML-Simple-0.13.tar.gz
+
+--
+
+It's pretty pathetic that you need a different source RPM for each Red
+Hat variant, but that seems to be the way of things. So for each
+modules, I unpacked it to get hold of the .spec file that needs
+editing, and the source tarball that it builds, as follows:
+ rpm2cpio perl-MARC-Record-2.0.2-1mdv2010.1.src.rpm | cpio -i
+And modified the extracted .spec file as necessary. The modified
+.spec files are part of this git archive; the tarballs are not.
+
+The final binary packages, build for centos5, are in the "centos5"
+directory. The build command is:
+ sudo rpmbuild -ba perl-MARC-Record.spec
+