Simplify top-level generate_gemfile_per_gem task

Rakefile

@@ -91,28 +91,19 @@ end
 
 desc "Generate per-gem Gemfiles and jbundle install each"
 task :generate_gemfile_per_gem do
-
   gems.each do |gname|
     Dir.chdir( gname ) do
-
       puts "=== Gemfile: #{gname} ==="
 
       File.open( 'Gemfile', 'w' ) do |fout|
         fout.write <<RUBY
 # -*- ruby -*-
 source :rubygems
 gemspec :path => '.', :name => '#{gname}'
-
-RJack::TarPit.last_spec.dependencies.each do |d|
-  gem( d.name, :path => "../\#\{d.name\}" ) if d.name =~ /^iudex/
-end
 RUBY
       end
 
-      system "jbundle install --path /home/david/.gem --local" or
-        raise "Failed with #{$?}"
-
+      sh "jbundle install --path #{ENV['HOME']}/.gem --local"
     end
   end
-
 end