2 files changed, 26 insertions, 6 deletions
diff --git a/lib/rubygems/bundler_integration.rb b/lib/rubygems/bundler_integration.rb
new file mode 100644
index 0000000000..28228e2398
--- /dev/null
+++ b/lib/rubygems/bundler_integration.rb
@@ -0,0 +1,23 @@
+# frozen_string_literal: true
+
+require "bundler/version"
+
+if Bundler::VERSION > "2.6.9"
+  require "bundler"
+else
+  previous_platforms = {}
+
+  platform_const_list = ["JAVA", "MSWIN", "MSWIN64", "MINGW", "X64_MINGW_LEGACY", "X64_MINGW", "UNIVERSAL_MINGW", "WINDOWS", "X64_LINUX", "X64_LINUX_MUSL"]
+
+  platform_const_list.each do |platform|
+    previous_platforms[platform] = Gem::Platform.const_get(platform)
+    Gem::Platform.send(:remove_const, platform)
+  end
+
+  require "bundler"
+
+  platform_const_list.each do |platform|
+    Gem::Platform.send(:remove_const, platform) if Gem::Platform.const_defined?(platform)
+    Gem::Platform.const_set(platform, previous_platforms[platform])
+  end
+end
diff --git a/lib/rubygems/request_set.rb b/lib/rubygems/request_set.rb
index 875df7e019..5a855fdb10 100644
--- a/lib/rubygems/request_set.rb
+++ b/lib/rubygems/request_set.rb
@@ -181,13 +181,10 @@ class Gem::RequestSet
 
     # Install requested gems after they have been downloaded
     sorted_requests.each do |req|
-      if req.installed?
+      if req.installed? && @always_install.none? {|spec| spec == req.spec.spec }
         req.spec.spec.build_extensions
-
-        if @always_install.none? {|spec| spec == req.spec.spec }
-          yield req, nil if block_given?
-          next
-        end
+        yield req, nil if block_given?
+        next
       end
 
       spec =