Rakefile in ruby-vpi-16.0.1

- old
+ new

@@ -21,10 +21,10 @@
 
 file 'Makefile' => [:swig, 'extconf.rb'] do |t|
   ruby t.prerequisites[1], "--with-cflags=#{ENV['CFLAGS']}", "--with-ldflags=#{ENV['LDFLAGS']}"
 end
 
-CLEAN.include 'Makefile', 'mkmf.log', '*.o', '*.so'
+CLEAN.include 'Makefile', 'mkmf.log', '*.o', '*.' + Config::CONFIG['DLEXT']
 
 
 desc 'Generate Ruby wrapper for VPI.'
 task :swig => 'swig_wrap.cin'
 