ruby-bio: FTBFS: Error: libxml-ruby library is not present.

[Andreas Moog]

Imported from Debian bug http://bugs.debian.org/730644:

Package: ruby-bio
Version: 1.4.3.0001-1
Severity: serious

Hello there,

I tried building your package in a clean unstable chroot, but it failed:

> ===============================================================================
> Failure:
> Error: libxml-ruby library is not present. Please install libxml-ruby library. It is needed for Bio::PhyloXML module. Unit test for PhyloXML will not be performed.
> <nil> is not true.
> test_libxml(Bio::TestPhyloXMLWriter_Check_LibXML)
> /«PKGBUILDDIR»/test/unit/bio/db/test_phyloxml_writer.rb:31:in `test_libxml'
> 28: module Bio
> 29: class TestPhyloXMLWriter_Check_LibXML < Test::Unit::TestCase
> 30: def test_libxml
> => 31: assert(defined?(LibXML),
> 32: "Error: libxml-ruby library is not present. Please install libxml-ruby library. It is needed for Bio::PhyloXML module. Unit test for PhyloXML will not be performed.")
> 33: end
> 34: end #class TestPhyloXMLWriter_Check_LibXML
> ===============================================================================
> F
> ===============================================================================
> Failure:
> Error: libxml-ruby library is not present. Please install libxml-ruby library. It is needed for Bio::PhyloXML module. Unit test for PhyloXML will not be performed.
> <nil> is not true.
> test_libxml(Bio::TestPhyloXML_Check_LibXML)
> /«PKGBUILDDIR»/test/unit/bio/db/test_phyloxml.rb:29:in `test_libxml'
> 26: module Bio
> 27: class TestPhyloXML_Check_LibXML < Test::Unit::TestCase
> 28: def test_libxml
> => 29: assert(defined?(LibXML),
> 30: "Error: libxml-ruby library is not present. Please install libxml-ruby library. It is needed for Bio::PhyloXML module. Unit test for PhyloXML will not be performed.")
> 31: end
> 32: end #class TestPhyloXML_LibXMLCheck
> ===============================================================================

I don't know why it is failing, the libxml-ruby library is pulled in via
the build-depends. I've attached a full buildlog.