[build] allow for Rakefile to be loaded without ruby-maven installed

Author: kares

Rakefile

@@ -1,24 +1,29 @@
 #-*- mode: ruby -*-
 
-require 'maven/ruby/tasks'
+begin
+  require 'maven/ruby/tasks'
+rescue LoadError
+  warn "ruby-maven not available - some tasks will not work " <<
+       "either `gem install ruby-maven' or use mvn instead of rake"
+else
+  Rake::Task[:jar].clear
+  desc "Package jopenssl.jar with the compiled classes"
+  task :jar => :maven do
+    maven.prepare_package '-Dmaven.test.skip'
+  end
+
+  namespace :jar do
+    desc "Package jopenssl.jar file (and dependendent jars)"
+    task :all => :maven do
+      maven.package '-Dmaven.test.skip'
+    end
+  end
+end
 
 # the actual build configuration is inside the Mavenfile
 
 task :default => :build
 
-Rake::Task[:jar].clear
-desc "Package jopenssl.jar with the compiled classes"
-task :jar => :maven do
-  maven.prepare_package '-Dmaven.test.skip'
-end
-
-namespace :jar do
-  desc "Package jopenssl.jar file (and dependendent jars)"
-  task :all => :maven do
-    maven.package '-Dmaven.test.skip'
-  end
-end
-
 file('lib/jopenssl.jar') { Rake::Task['jar'].invoke }
 
 require 'rake/testtask'