Include the code that we need

lib/capybara_webkit_builder.rb

@@ -16,32 +16,17 @@ def qmake_bin
     ENV['QMAKE'] || default_qmake_binary
   end
 
-  def spec
-    ENV['SPEC'] || os_spec
-  end
-
   def default_qmake_binary
     case RbConfig::CONFIG['host_os']
     when /freebsd/
       "qmake-qt4"
+    when /openbsd/
+      "qmake-qt5"
     else
       "qmake"
     end
   end
 
-  def os_spec
-    case RbConfig::CONFIG['host_os']
-    when /linux/
-      "linux-g++"
-    when /freebsd/
-      "freebsd-g++"
-    when /mingw32/
-      "win32-g++"
-    else
-      "macx-g++"
-    end
-  end
-
   def sh(command)
     system(command)
     success = $?.exitstatus == SUCCESS_STATUS

src/StdinNotifier.cpp

@@ -1,6 +1,7 @@
 #include "StdinNotifier.h"
 
 #include <QTcpServer>
+#include <iostream>
 
 StdinNotifier::StdinNotifier(QObject *parent) : QObject(parent) {
   m_notifier = new QSocketNotifier(fileno(stdin), QSocketNotifier::Read, this);

src/StdinNotifier.h

@@ -1,6 +1,7 @@
 #include <QObject>
 
 class QSocketNotifier;
+#include <QSocketNotifier>
 
 class StdinNotifier : public QObject {
   Q_OBJECT

src/WebPage.h

@@ -1,5 +1,6 @@
 #ifndef _WEBPAGE_H
 #define _WEBPAGE_H
+#include <QtGlobal>
 #if QT_VERSION >= QT_VERSION_CHECK(5, 0, 0)
 #include <QtWebKitWidgets>
 #else