Sections are provided in PBMake scripts so you can place many
      different sets of directives into a single script.

      PBMake can use up to 99 sections.

      This example has three sections:

        EXEFILE=

        LINKFILE=

        LINKER=

        COMPILER1=
        FLAG1=
        PROG1=
        SRCDIR1=
        OBJDIR1=

        COMPILER2=
        FLAG2=
        PROG2=
        SRCDIR2=
        OBJDIR2=

        COMPILER3=
        FLAG3=
        PROG3=
        SRCDIR3=
        OBJDIR3=