[Reproducible-builds] Bug#794134: FTBFS: `require': cannot load such file -- hmac/sha1 (LoadError)

[Chris West (Faux)]

Source: ruby-openid
Version: 2.5.0debian-1
Severity: serious
Tags: sid stretch
Justification: fails to build from source
User: reproducible-builds at lists.alioth.debian.org
Usertags: ftbfs

Dear Maintainer,

The package fails to build:

RUBYLIB=/tmp/buildd/ruby-openid-2.5.0debian/debian/ruby-openid/usr/lib/ruby/vendor_ruby:. ruby2.2 debian/ruby-tests.rb
/usr/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:54:in `require': cannot load such file -- hmac/sha1 (LoadError)
	from /usr/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:54:in `require'
	from /tmp/buildd/ruby-openid-2.5.0debian/debian/ruby-openid/usr/lib/ruby/vendor_ruby/openid/cryptutil.rb:13:in `rescue in rescue in <top (required)>'
	from /tmp/buildd/ruby-openid-2.5.0debian/debian/ruby-openid/usr/lib/ruby/vendor_ruby/openid/cryptutil.rb:7:in `rescue in <top (required)>'
	from /tmp/buildd/ruby-openid-2.5.0debian/debian/ruby-openid/usr/lib/ruby/vendor_ruby/openid/cryptutil.rb:4:in `<top (required)>'
	from /usr/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:54:in `require'
	from /usr/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:54:in `require'
	from /tmp/buildd/ruby-openid-2.5.0debian/debian/ruby-openid/usr/lib/ruby/vendor_ruby/openid/dh.rb:2:in `<top (required)>'
	from /usr/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:54:in `require'
	from /usr/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:54:in `require'
	from /tmp/buildd/ruby-openid-2.5.0debian/debian/ruby-openid/usr/lib/ruby/vendor_ruby/openid/consumer/associationmanager.rb:1:in `<top (required)>'
	from /usr/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:54:in `require'
	from /usr/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:54:in `require'
	from /tmp/buildd/ruby-openid-2.5.0debian/test/test_associationmanager.rb:2:in `<top (required)>'
	from /usr/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:54:in `require'
	from /usr/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:54:in `require'
	from debian/ruby-tests.rb:5:in `block in <main>'
	from debian/ruby-tests.rb:5:in `each'
	from debian/ruby-tests.rb:5:in `<main>'
ERROR: Test "ruby2.2" failed. Exiting.
dh_auto_install: dh_ruby --install /tmp/buildd/ruby-openid-2.5.0debian/debian/ruby-openid returned exit code 1

Full build log:
https://reproducible.debian.net/rb-pkg/unstable/amd64/ruby-openid.html

-- System Information:
Debian Release: stretch/sid
  APT prefers unstable
  APT policy: (500, 'unstable')
Architecture: amd64 (x86_64)

Kernel: Linux 3.19.0-23-generic (SMP w/8 CPU cores)
Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)