
There were problems with putting e_os.h just into the top directory, because the test programs are compiled within test/ in the "standard" case in in their original directories in the makefile.one case; and in the latter symlinks may not be available.
The stuff in here is based on patches supplied to me by Steven Schoch <schoch@sheba.arc.nasa.gov> to do DSS. I have since modified a them a little but a debt of gratitude is due for doing the initial work.