```ruby
require 'mkmf'

if have_library("mbus","mbus_parse")
then
  create_makefile("mbus")
else
  puts "No libmbus support available"
end

```

Fix trouble compiling on ruby 1.9.3.
user
```ruby
require 'mkmf'

if have_library("mbus","main")
then
  create_makefile("mbus")
else
  puts "No libmbus support available"
end

```
assistant