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-rw-r--r--lib/reline/reline.gemspec2
1 files changed, 2 insertions, 0 deletions
diff --git a/lib/reline/reline.gemspec b/lib/reline/reline.gemspec
index 763c0f8bc3..2265cd224c 100644
--- a/lib/reline/reline.gemspec
+++ b/lib/reline/reline.gemspec
@@ -23,5 +23,7 @@ Gem::Specification.new do |spec|
spec.add_development_dependency 'bundler'
spec.add_development_dependency 'rake'
spec.add_development_dependency 'test-unit'
+ is_unix = RUBY_PLATFORM =~ /(aix|darwin|linux|(net|free|open)bsd|cygwin|solaris|irix|hpux)/i
+ spec.add_development_dependency 'vterm', '>= 0.0.5' if is_unix
spec.add_development_dependency 'yamatanooroti', '>= 0.0.6'
end