https://git.ruby-lang.org/ruby.git/commit/?id=bacb646169

From bacb646169bf33ee6a317fa647ddd67853fbe62d Mon Sep 17 00:00:00 2001
From: aycabta <aycabta@g...>
Date: Sun, 4 Apr 2021 02:50:33 +0900
Subject: [ruby/irb] Check WITH_VTERM env to add vterm gem as dependency

https://github.com/ruby/irb/commit/23c8b73cb1
---
 lib/irb/irb.gemspec | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/irb/irb.gemspec b/lib/irb/irb.gemspec
index 9b2b005..ccb0503 100644
--- a/lib/irb/irb.gemspec
+++ b/lib/irb/irb.gemspec
@@ -39,7 +39,7 @@ Gem::Specification.new do |spec| https://github.com/ruby/ruby/blob/trunk/lib/irb/irb.gemspec#L39
   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
-- 
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