The UDUNITS package supports units of physical quantities. Its C library provides for arithmetic manipulation of units and for conver
Step 1: Download udunits-2.1.24 from ftp://ftp.unidata.ucar.edu/pub/udunits/
Step 2:Untar and compile
# tar -zxvf udunits-2.1.24 # cd udunits-2.1.24 # ./configure --prefix=/usr/local/udunits-2.1.24 CC=gcc CXX=g++ # make # make install