I need the following header files (I know they will work with my computer
because I used to have them until my computer crashed.  Now I need them to
compile certain programs I have written.  They did not come with the
original compiler, and I got them from a vax last time but no longer have
access to)

sys/stdsyms.h                           netinet/in_systm.h
sys/stropts.h                             lastlog.h

net/nit_if.h
net/nit_buf.h