1 files changed, 7 insertions, 3 deletions
diff --git a/railties/lib/rails/gem_dependency.rb b/railties/lib/rails/gem_dependency.rb
index 3cc75494e4..06d830ba24 100644
--- a/railties/lib/rails/gem_dependency.rb
+++ b/railties/lib/rails/gem_dependency.rb
@@ -122,10 +122,14 @@ module Rails
 
     def built?
       return false unless frozen?
-      specification.extensions.each do |ext|
-        makefile = File.join(unpacked_gem_directory, File.dirname(ext), 'Makefile')
-        return false unless File.exists?(makefile)
+
+      if vendor_gem?
+        specification.extensions.each do |ext|
+          makefile = File.join(unpacked_gem_directory, File.dirname(ext), 'Makefile')
+          return false unless File.exists?(makefile)
+        end
       end
+
       true
     end