diff --git a/lib/rscons/builder.rb b/lib/rscons/builder.rb
index b82f918..41e16da 100644
--- a/lib/rscons/builder.rb
+++ b/lib/rscons/builder.rb
@@ -8,6 +8,15 @@ module Rscons
   class Builder
 
     class << self
+      # Return a String specifying an extra path component used to
+      # differentiate build targets built by this builder from others.
+      #
+      # @return [String, nil]
+      #   Extra path component used to differentiate build targets built by
+      #   this builder from others.
+      def extra_path
+      end
+
       # Return the name of the builder.
       #
       # If not overridden this defaults to the last component of the class name.
diff --git a/lib/rscons/builders/shared_object.rb b/lib/rscons/builders/shared_object.rb
index 64942ce..3a355a8 100644
--- a/lib/rscons/builders/shared_object.rb
+++ b/lib/rscons/builders/shared_object.rb
@@ -5,6 +5,12 @@ module Rscons
     # source files.
     class SharedObject < Builder
       include Mixins::Object
+
+      class << self
+        def extra_path
+          "_shared"
+        end
+      end
     end
   end
 end
diff --git a/lib/rscons/environment.rb b/lib/rscons/environment.rb
index 6d581f6..4f7fa71 100644
--- a/lib/rscons/environment.rb
+++ b/lib/rscons/environment.rb
@@ -245,7 +245,9 @@ module Rscons
     # @return [String]
     #   The file name to be built from +source_fname+ with suffix +suffix+.
     def get_build_fname(source_fname, suffix, builder_class)
-      extra_path = builder_class == Builders::SharedObject ? "/_shared" : ""
+      if extra_path = builder_class.extra_path
+        extra_path = "/#{extra_path}"
+      end
       "#{@build_root}#{extra_path}/#{Util.make_relative_path(Rscons.set_suffix(source_fname, suffix))}".gsub("\\", "/")
     end