general build refinements

Signed-off-by: Roy Storey <roy.storey@plantandfood.co.nz>
more useful info in README

Signed-off-by: Roy Storey <roy.storey@plantandfood.co.nz>
minor typo causing compile warnings and errors. s/lsd/lsf/

Signed-off-by: Roy Storey <roy.storey@plantandfood.co.nz>
fix for issue #3 I hope