libjson-xs-perl 2.260-1 (i386 binary) in ubuntu lucid

 This module converts Perl data structures to JSON and vice versa. Its
 primary goal is to be correct and its secondary goal is to be
 fast. To reach the latter goal it was written in C.
 .
 Beginning with version 2.0 of the JSON module, when both JSON and
 JSON::XS are installed, then JSON will fall back on JSON::XS (this can be
 overridden) with no overhead due to emulation (by inheriting constructor
 and methods). If JSON::XS is not available, it will fall back to the
 compatible JSON::PP module as backend, so using JSON instead of JSON::XS
 gives you a portable JSON API that can be fast when you need and doesn't
 require a C compiler when that is a problem.