Try to find gemspec from `.bundle/specifications

tool/rbinstall.rb

@@ -1026,17 +1026,22 @@ def install_default_gem(dir, srcdir, bindir)
   File.foreach("#{srcdir}/gems/bundled_gems") do |name|
     next if /^\s*(?:#|$)/ =~ name
     next unless /^(\S+)\s+(\S+).*/ =~ name
+    gem = $1
     gem_name = "#$1-#$2"
-    # Try to find the gemspec file
-    path = "#{srcdir}/.bundle/gems/#{gem_name}/#{name}.gemspec"
+    # Try to find the original gemspec file
+    path = "#{srcdir}/.bundle/gems/#{gem_name}/#{gem}.gemspec"
     unless File.exist?(path)
       # Try to find the gemspec file for C ext gems
       # ex .bundle/gems/debug-1.7.1/debug-1.7.1.gemspec
       # This gemspec keep the original dependencies
       path = "#{srcdir}/.bundle/gems/#{gem_name}/#{gem_name}.gemspec"
       unless File.exist?(path)
-         skipped[gem_name] = "gemspec not found"
-         next
+          # Try to find the gemspec file for gems that hasn't own gemspec
+          path = "#{srcdir}/.bundle/specifications/#{gem_name}.gemspec"
+          unless File.exist?(path)
+            skipped[gem_name] = "gemspec not found"
+            next
+          end
       end
     end
     spec = load_gemspec(path, "#{srcdir}/.bundle/gems/#{gem_name}")