diff --git a/ext/jasmine-webkit-specrunner/extconf.rb b/ext/jasmine-webkit-specrunner/extconf.rb
index 6980885..79e68d3 100644
--- a/ext/jasmine-webkit-specrunner/extconf.rb
+++ b/ext/jasmine-webkit-specrunner/extconf.rb
@@ -7,4 +7,7 @@ require 'qt/qmake'
 system %{make clean}
 Qt::Qmake.make!('jasmine-headless-webkit', 'specrunner.pro')
 
+# The build above can fail silently. So we check for the existence of the binary.
+raise "\n***********************\nGem jasmine-headless-webkit-firstbanco failed to build. Have you got qtmake installed? On linux you need: sudo apt-get install libqtwebkit-dev qt4-dev-tools" unless File.exist?(File.expand_path('../jasmine-webkit-specrunner', __FILE__))
+
 FileUtils.cp File.expand_path('../Makefile.dummy', __FILE__), File.expand_path('../Makefile', __FILE__)
diff --git a/jasmine-headless-webkit-firstbanco.gemspec b/jasmine-headless-webkit-firstbanco.gemspec
index b228b93..b284293 100644
--- a/jasmine-headless-webkit-firstbanco.gemspec
+++ b/jasmine-headless-webkit-firstbanco.gemspec
@@ -4,7 +4,7 @@ require "jasmine/headless/version"
 
 Gem::Specification.new do |s|
   s.name        = "jasmine-headless-webkit-firstbanco"
-  s.version     = '0.9.0.rc.4'
+  s.version     = '0.9.0.rc.5'
   s.platform    = Gem::Platform::RUBY
   s.authors     = ["John Bintz", "Sencha Inc.", "Pivotal Labs"]
   s.email       = ["john@coswellproductions.com"]