gem install outputs:

Couldn't find file to include '../doc/col_sep.rdoc' from lib/csv.rb
Couldn't find file to include '../doc/row_sep.rdoc' from lib/csv.rb
Couldn't find file to include '../doc/quote_char.rdoc' from lib/csv.rb
Couldn't find file to include '../doc/field_size_limit.rdoc' from lib/csv.rb
Couldn't find file to include '../doc/converters.rdoc' from lib/csv.rb
Couldn't find file to include '../doc/unconverted_fields.rdoc' from lib/csv.rb
Couldn't find file to include '../doc/headers.rdoc' from lib/csv.rb
Couldn't find file to include '../doc/return_headers.rdoc' from lib/csv.rb
Couldn't find file to include '../doc/header_converters.rdoc' from lib/csv.rb
Couldn't find file to include '../doc/skip_blanks.rdoc' from lib/csv.rb
Couldn't find file to include '../doc/skip_lines.rdoc' from lib/csv.rb
Couldn't find file to include '../doc/liberal_parsing.rdoc' from lib/csv.rb
Couldn't find file to include '../doc/nil_value.rdoc' from lib/csv.rb
Couldn't find file to include '../doc/empty_value.rdoc' from lib/csv.rb
Couldn't find file to include '../doc/col_sep.rdoc' from lib/csv.rb
Couldn't find file to include '../doc/row_sep.rdoc' from lib/csv.rb
Couldn't find file to include '../doc/quote_char.rdoc' from lib/csv.rb
Couldn't find file to include '../doc/write_headers.rdoc' from lib/csv.rb
Couldn't find file to include '../doc/force_quotes.rdoc' from lib/csv.rb
Couldn't find file to include '../doc/quote_empty.rdoc' from lib/csv.rb
Couldn't find file to include '../doc/write_converters.rdoc' from lib/csv.rb
Couldn't find file to include '../doc/write_nil_value.rdoc' from lib/csv.rb
Couldn't find file to include '../doc/write_empty_value.rdoc' from lib/csv.rb
Couldn't find file to include '../doc/strip.rdoc' from lib/csv.rb