There is at least one past user of NetBSD
Please install boostlibs from pkg_add not pkgsrc (I am thinking that you use current pkgsrc snapshot and therefore you get errors).
ftp://ftp.netbsd.org/pub/NetBSD/pack...ibs-1.46.1.tgz
You can add above
ftp://ftp.netbsd.org/pub/NetBSD/packages/5.1/amd64/All as PKG_PATH variable (or use any other mirror).
Then you can compile Kicad from sources- if I was you I would attempt to create a port and put in in pkgsrc WIP repository.
This is all- if you don't have a time just install OpenBSD or FreeBSD (FreeBSD would suite you much better).
Good luck!
Pjoter.