$ symfony plugin-install local http://pear.symfony-project.com/MojoPlugin
>> plugin    installing plugin "http://pear.symfony-project.com/MojoPlugin"
>> pear      Could not download from "http:/...symfony-project.com/MojoPlugin"
>> pear      Invalid or missing remote package file
>> pear      Package "http://pear.symfony-pr...ct.com/MojoPlugin" is not valid


  [Exception]
  install failed