libudunits2-dev 2.1.23-4 (armhf binary) in ubuntu saucy

 The UDUNITS package supports units of physical quantities (e.g., meters,
 seconds). Specifically, it supports conversion between string and binary
 representations of units, arithmetic manipulation of units, and conversion of
 numeric values between compatible units. The package is written in the
 C programming language.
 .
 This package provides the include files and static libraries for development.