build version not updated after git pull

Dear All,

Thanks for fixing the bugs I reported last time. Obviously there is another minor issue.

When I reported last time I had the following version:

ntpsec-0.9.7+664 2017-05-20T13:07:05-0400

I made the usual steps to upgrade ( but maybe not all of them ? )

git pull
./waf build
./waf install ( as root ) 

I see the binaries have a new time stamp and the bugs are fixed. But I have still the old version listed. Only if I start from scratch with "rm -r" and "git clone ... " I get the current version listed:

ntpsec-0.9.7+668 2017-05-22T04:09:38-0400

This is a little bit annoying because the complete build process takes much much longer than just a minor change.

Do I something wrong in my install procedure ?

Kind regard
Hans