[DRE-maint] Bug#791768: FTBFS: Error in ruby2.1: munmap_chunk(): invalid pointer

[Christian Hofstaedtler]

Source: ruby-bert
Version: 1.1.6-1
Severity: serious
Justification: fails to build from source

Dear Maintainer,

your package FTBFS, but built in the past.

Relevant snippet from the build log:

RUBYLIB=/«PKGBUILDDIR»/debian/ruby-bert/usr/lib/x86_64-linux-gnu/ruby/vendor_ruby/2.1.0:/«PKGBUILDDIR»/debian/ruby-bert/usr/lib/ruby/vendor_ruby:. ruby2.1 -ryaml -e YAML.load_file\(\"debian/ruby-test-files.yaml\"\).each\ \{\ \|f\|\ require\ f\ \}
*** Error in `ruby2.1': munmap_chunk(): invalid pointer: 0x00007fcf31e78e30 ***
/usr/lib/ruby/vendor_ruby/gem2deb/test_runner.rb:115:in `exit': no implicit conversion from nil to integer (TypeError)
        from /usr/lib/ruby/vendor_ruby/gem2deb/test_runner.rb:115:in `run_ruby'
        from /usr/lib/ruby/vendor_ruby/gem2deb/test_runner.rb:162:in `do_run_tests'
        from /usr/lib/ruby/vendor_ruby/gem2deb/test_runner.rb:69:in `run_tests'
        from /usr/bin/gem2deb-test-runner:53:in `<main>'
ERROR: Test "ruby2.1" failed. Exiting.

Best,
Christian
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