https://git.ruby-lang.org/ruby.git/commit/?id=63872c7e31

From 63872c7e31b7a183d8fd0caec2878ea9c4b73ef3 Mon Sep 17 00:00:00 2001
From: Hiroshi SHIBATA <hsbt@r...>
Date: Sun, 1 Dec 2019 08:02:06 +0900
Subject: [ruby/gdbm] Workaround for GitHub Actions

https://github.com/ruby/gdbm/commit/f42103fe93

diff --git a/test/gdbm/test_gdbm.rb b/test/gdbm/test_gdbm.rb
index 64692a4..e02282b 100644
--- a/test/gdbm/test_gdbm.rb
+++ b/test/gdbm/test_gdbm.rb
@@ -143,7 +143,7 @@ if defined? GDBM https://github.com/ruby/ruby/blob/trunk/test/gdbm/test_gdbm.rb#L143
 
     def open_db_child(dbname, *opts)
       opts = [0644, *opts].map(&:inspect).join(', ')
-      args = [EnvUtil.rubybin, "-rgdbm", "-e", <<-SRC, dbname]
+      args = [EnvUtil.rubybin, "-Ilib", "-rgdbm", "-e", <<-SRC, dbname]
       STDOUT.sync = true
       gdbm = GDBM.open(ARGV.shift, #{opts})
       puts gdbm.class
-- 
cgit v0.10.2


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