rb++ problem

frontpanelDriver.h

#ifndef frontpanelDriver_DEF
#define frontpanelDriver_DEF

using namespace some::namespace;

class FrontPanelDriver
{
public:
    FrontPanelDriver();
    ~FrontPanelDriver();

    // lots of methods that that use objects from some::namespace
    
private:
    //some stuff here
};
#endif

generate.rb

require 'rubygems'
require 'rbplusplus'
include RbPlusPlus

Extension.new "frontpanelDriver" do |f|
  f.sources ["testing.h"],
    :library_paths => ["../build/frontpanelDriver"],
    :libraries => ["frontpaneldriver"],
    :include_paths => ["/usr/local/share/gccxml-0.9/GCC/4.8", "/usr/local/include", "."]
  f.namespace "test"
end

testing.h

#ifndef testing_DEF
#define testing_DEF

// Things work fine until this include is added.
#include "frontpanelDriver.h"

namespace test
{
class testing
{
public:
    testing();
    ~testing();
};
}
#endif