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-rw-r--r--lib/irb/irb.gemspec2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/irb/irb.gemspec b/lib/irb/irb.gemspec
index 9b2b005ca0..ccb05036ee 100644
--- a/lib/irb/irb.gemspec
+++ b/lib/irb/irb.gemspec
@@ -39,7 +39,7 @@ Gem::Specification.new do |spec|
spec.add_dependency "reline", ">= 0.1.5"
spec.add_development_dependency "bundler"
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 'vterm', '>= 0.0.5' if is_unix && ENV['WITH_VTERM']
spec.add_development_dependency 'yamatanooroti', '>= 0.0.6'
spec.add_development_dependency "rake"
end