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$ perl -MModule::Build -e 'Module::Build->prompt("are you there","Y")'
are you there [Y] 
Y

  $user_install_base = Module::Build->prompt("Where to install?","/usr
+/local");
  Module::Build->new(
...
    install_base => $user_install_base,
    ...
  );

$ perl Build.PL install_base=/home/david

or

$ Build install install_base=/home/david