location of the object code.  By default it
             goes into a tree whose root is also the parent of the src
             and prog directories.  This can be changed using the
             ROOT_DIR variable in makefile.

       * Build the library:
         - To make an optimized version of the library (in src):
               make
         - To make a debug version of the library (in src):
               make DEBUG=yes debug
         - To make a shared library version (in src):
               make SHA