ruby-pdf-reader: FTBFS: configuration.rb:656:in `block in expect_with': :stdlib is not supported (ArgumentError)

Imported from Debian bug http://bugs.debian.org/795763:

Source: ruby-pdf-reader
Version: 1.3.3-1
Severity: serious
Justification: fails to build from source
User: <email address hidden>
Usertags: ftbfs
X-Debbugs-Cc: <email address hidden>

Dear Maintainer,

ruby-pdf-reader fails to build from source on unstable/amd64:

  [..]
  /usr/bin/ruby2.1 /usr/bin/gem2deb-test-runner
  Running tests for ruby2.1 using debian/ruby-tests.rake ...
  RUBYLIB=/tmp/buildd/ruby-pdf-reader-1.3.3/debian/ruby-pdf-reader/usr/lib/ruby/vendor_ruby:.
  ruby2.1 -rrake -e ARGV.unshift\(\"-f\",\
  \"debian/ruby-tests.rake\"\)\;\ Rake.application.run
  /usr/bin/ruby2.1 /usr/bin/rspec --pattern
  spec/\*\*\{,/\*/\*\*\}/\*_spec.rb
  /usr/lib/ruby/vendor_ruby/rspec/core/configuration.rb:656:in `block in
  expect_with': :stdlib is not supported (ArgumentError)
   from
   /usr/lib/ruby/vendor_ruby/rspec/core/configuration.rb:635:in
   `map'
   from
   /usr/lib/ruby/vendor_ruby/rspec/core/configuration.rb:635:in
   `expect_with'
   from /tmp/buildd/ruby-pdf-reader-1.3.3/spec/spec_helper.rb:20:in
   `block in <top (required)>'
   from /usr/lib/ruby/vendor_ruby/rspec/core.rb:97:in `configure'
   from /tmp/buildd/ruby-pdf-reader-1.3.3/spec/spec_helper.rb:19:in
   `<top (required)>'
   from
   /usr/lib/ruby/2.1.0/rubygems/core_ext/kernel_require.rb:55:in
   `require'
   from
   /usr/lib/ruby/2.1.0/rubygems/core_ext/kernel_require.rb:55:in
   `require'
   from /tmp/buildd/ruby-pdf-reader-1.3.3/spec/buffer_spec.rb:3:in
   `<top (required)>'
   from
   /usr/lib/ruby/vendor_ruby/rspec/core/configuration.rb:1327:in
   `load'
   from
   /usr/lib/ruby/vendor_ruby/rspec/core/configuration.rb:1327:in
   `block in load_spec_files'
   from
   /usr/lib/ruby/vendor_ruby/rspec/core/configuration.rb:1325:in
   `each'
   from
   /usr/lib/ruby/vendor_ruby/rspec/core/configuration.rb:1325:in
   `load_spec_files'
   from /usr/lib/ruby/vendor_ruby/rspec/core/runner.rb:103:in
   `setup'
   from /usr/lib/ruby/vendor_ruby/rspec/core/runner.rb:89:in `run'
   from /usr/lib/ruby/vendor_ruby/rspec/core/runner.rb:74:in `run'
   from /usr/lib/ruby/vendor_ruby/rspec/core/runner.rb:42:in
   `invoke'
   from /usr/bin/rspec:4:in `<main>'
  /usr/bin/ruby2.1 /usr/bin/rspec --pattern
  spec/\*\*\{,/\*/\*\*\}/\*_spec.rb failed
  ERROR: Test "ruby2.1" failed. Exiting.
  dh_auto_install: dh_ruby --install
  /tmp/buildd/ruby-pdf-reader-1.3.3/debian/ruby-pdf-reader returned exit
  code 1
  debian/rules:18: recipe for target 'override_dh_auto_install' failed
  make[1]: *** [override_dh_auto_install] Error 1
  make[1]: Leaving directory '/tmp/buildd/ruby-pdf-reader-1.3.3'
  debian/rules:15: recipe for target 'binary' failed
  make: *** [binary] Error 2
  dpkg-buildpackage: error: fakeroot debian/rules binary gave error exit
  status 2

  [..]

The full build log is attached or can be viewed here:

  https://reproducible.debian.net/logs/unstable/amd64/ruby-pdf-reader_1.3.3-1.build1.log.gz

Regards,

--
      ,''`.
     : :' : Chris Lamb
     `. `'` <email address hidden> / chris-lamb.co.uk
       `-