[DRE-maint] Bug#909863: ruby-gsl FTBFS on i386: test failure

[Adrian Bunk]

Source: ruby-gsl
Version: 2.1.0.3+dfsg1-1
Severity: serious
Tags: ftbfs

https://tests.reproducible-builds.org/debian/rb-pkg/unstable/i386/ruby-gsl.html

...
===============================================================================
Failure: test_TDS_cyc_solve(LinalgTest):
  solve_TDS_cyc dim=5: 5[1]:    2.99999999999997513                      3.
  <true> is neither nil or false.
linalg_test.rb:11:in `_check'
linalg_test.rb:417:in `block in _test_TDS_cyc_solve_one'
linalg_test.rb:416:in `times'
linalg_test.rb:416:in `_test_TDS_cyc_solve_one'
linalg_test.rb:460:in `test_TDS_cyc_solve'
     457:     rhs = GSL::Vector[30, -24, 3, 21, -30]
     458:     actual = GSL::Vector[12, 3, -42, 42, -21]
     459: 
  => 460:     _test_TDS_cyc_solve_one(5, diag, offdiag, rhs, actual, 35.0, 'solve_TDS_cyc dim=5')
     461:   end
     462: 
     463: end
===============================================================================
....
Finished in 0.026586611 seconds.
-------------------------------------------------------------------------------
11 tests, 371 assertions, 1 failures, 0 errors, 0 pendings, 0 omissions, 0 notifications
90.9091% passed
-------------------------------------------------------------------------------
413.74 tests/s, 13954.39 assertions/s
ERROR: Test "ruby2.5" failed. Exiting.
dh_auto_install: dh_ruby --install /build/1st/ruby-gsl-2.1.0.3\+dfsg1/debian/ruby-gsl returned exit code 1
make: *** [debian/rules:4: binary] Error 1