Per compilare libgphonenumber:

1. Andare su http://closure-compiler.appspot.com/

2. Inserire il testo seguente:

// ==ClosureCompiler==
// @compilation_level SIMPLE_OPTIMIZATIONS
// @output_file_name libphonenumber.js
// @use_closure_library true
// @code_url https://github.com/googlei18n/libphonenumber/raw/master/javascript/i18n/phonenumbers/phonemetadata.pb.js
// @code_url https://github.com/googlei18n/libphonenumber/raw/master/javascript/i18n/phonenumbers/phonenumber.pb.js
// @code_url https://github.com/googlei18n/libphonenumber/raw/master/javascript/i18n/phonenumbers/metadata.js
// @code_url https://github.com/googlei18n/libphonenumber/raw/master/javascript/i18n/phonenumbers/phonenumberutil.js
// @code_url https://github.com/googlei18n/libphonenumber/raw/master/javascript/i18n/phonenumbers/asyoutypeformatter.js
// @formatting pretty_print
// ==/ClosureCompiler==

3. Premere su "Compile".

4. E via.