diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3b342e8..48e42ac 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -10,6 +10,10 @@ upgrading.
 
 ## [Unreleased]
 
+### Added
+- Introduce `--include-shared-dir` to specify additional directory where to
+  lookup platform-specific shared libraries to bundle in the package. (#34)
+
 ### Fixed
 - Solve RubyGems 2.6.x changes on exception hierarchy. Thanks to @MSP-Greg (#30)
 
diff --git a/lib/rubygems/commands/compile_command.rb b/lib/rubygems/commands/compile_command.rb
index d081045..87b7fc1 100644
--- a/lib/rubygems/commands/compile_command.rb
+++ b/lib/rubygems/commands/compile_command.rb
@@ -9,6 +9,10 @@ def initialize
       options[:output] = File.expand_path(value, Dir.pwd)
     end
 
+    add_option "--include-shared-dir DIR", "Additional directory for shared libraries" do |value, options|
+      options[:include_shared_dir] = value
+    end
+
     add_option "--prune", "Clean non-existing files during re-packaging" do |value, options|
       options[:prune] = true
     end
diff --git a/lib/rubygems/compiler.rb b/lib/rubygems/compiler.rb
index 93317f5..2db9e74 100644
--- a/lib/rubygems/compiler.rb
+++ b/lib/rubygems/compiler.rb
@@ -25,6 +25,12 @@ def compile
 
     artifacts = collect_artifacts
 
+    if shared_dir = options[:include_shared_dir]
+      shared_libs = collect_shared(shared_dir)
+
+      artifacts.concat shared_libs
+    end
+
     # build a new gemspec from the original one
     gemspec = installer.spec.dup
 
@@ -75,6 +81,12 @@ def collect_artifacts
     Dir.glob("#{target_dir}/{#{lib_dirs}}/**/*.#{dlext}")
   end
 
+  def collect_shared(shared_dir)
+    libext = platform_shared_ext
+
+    Dir.glob("#{target_dir}/#{shared_dir}/**/*.#{libext}")
+  end
+
   def info(msg)
     say msg if Gem.configuration.verbose
   end
@@ -87,6 +99,21 @@ def installer
     @installer ||= prepare_installer
   end
 
+  def platform_shared_ext
+    platform = Gem::Platform.local
+
+    case platform.os
+    when /darwin/
+      "dylib"
+    when /linux|bsd|solaris/
+      "so"
+    when /mingw|mswin|cygwin|msys/
+      "dll"
+    else
+      "so"
+    end
+  end
+
   def prepare_installer
     # RubyGems 2.5 specifics
     unpack_options = options.dup.merge(unpack: true)
diff --git a/test/rubygems/test_gem_compiler.rb b/test/rubygems/test_gem_compiler.rb
index 45e006a..b246f0d 100644
--- a/test/rubygems/test_gem_compiler.rb
+++ b/test/rubygems/test_gem_compiler.rb
@@ -235,6 +235,78 @@ def test_compile_bundle_artifacts_path_with_spaces
     end
   end
 
+  def test_compile_bundle_extra_artifacts_linux
+    util_set_arch "x86_64-linux"
+
+    name = 'a'
+
+    artifact = "shared.so"
+    old_spec = ''
+
+    gem_file = util_bake_gem(name) { |spec|
+      old_spec = spec
+      util_fake_extension spec, name, <<-EOF
+        require "fileutils"
+
+        FileUtils.touch "#{artifact}"
+
+        File.open 'Rakefile', 'w' do |rf| rf.puts "task :default" end
+      EOF
+    }
+
+    compiler = Gem::Compiler.new(gem_file,
+      :output => @output_dir, :include_shared_dir => "ext")
+
+    output_gem = nil
+
+    use_ui @ui do
+      output_gem = compiler.compile
+    end
+
+    assert_path_exists File.join(@output_dir, output_gem)
+    actual_spec = util_read_spec File.join(@output_dir, output_gem)
+
+    assert_includes actual_spec.files, "ext/#{name}/#{artifact}"
+  ensure
+    util_reset_arch
+  end
+
+  def test_compile_bundle_extra_artifacts_windows
+    util_set_arch "i386-mingw32"
+
+    name = 'a'
+
+    artifact = "shared.dll"
+    old_spec = ''
+
+    gem_file = util_bake_gem(name) { |spec|
+      old_spec = spec
+      util_fake_extension spec, name, <<-EOF
+        require "fileutils"
+
+        FileUtils.touch "#{artifact}"
+
+        File.open 'Rakefile', 'w' do |rf| rf.puts "task :default" end
+      EOF
+    }
+
+    compiler = Gem::Compiler.new(gem_file,
+      :output => @output_dir, :include_shared_dir => "ext")
+
+    output_gem = nil
+
+    use_ui @ui do
+      output_gem = compiler.compile
+    end
+
+    assert_path_exists File.join(@output_dir, output_gem)
+    actual_spec = util_read_spec File.join(@output_dir, output_gem)
+
+    assert_includes actual_spec.files, "ext/#{name}/#{artifact}"
+  ensure
+    util_reset_arch
+  end
+
   def test_compile_lock_ruby_abi
     util_reset_arch