fix Gem installation command with versions

railties/CHANGELOG

+*SVN*
+
+* Use a system command to install gems, since GemRunner exits the ruby process.  #210 [Tim Morgan]
+
 *2.1.0 RC1 (May 11th, 2008)*
 
 * script/dbconsole fires up the command-line database client.  #102 [Steve Purcell]

railties/lib/rails/gem_dependency.rb

@@ -73,7 +73,9 @@ def load_paths_added?
     end
 
     def install
-      puts `#{gem_command} #{install_command.join(' ')}`
+      cmd = "#{gem_command} #{install_command.join(' ')}"
+      puts cmd
+      puts %x(#{cmd})
     end
     
     def unpack_to(directory)
@@ -107,7 +109,7 @@ def gem_command
 
     def install_command
       cmd = %w(install) << @name
-      cmd << "--version" << "#{@requirement.to_s}" if @requirement
+      cmd << "--version" << %("#{@requirement.to_s}") if @requirement
       cmd << "--source"  << @source  if @source
       cmd
     end