#1 The ANTLR_HOME in grammar.mk is to be set
       to the home directory where ANTLR is installed.

    #2 make -f grammar.mk

       before running 'make' to create the SD package
       library. The above make will create the ANTLR
       lexer/parser source code from the SD grammar
       file sd_grammar.g. 
       The ANTLR generated classes can/will be used by 
       the information providers part of the SD adaptors.