Log message:
According to Avon Barksdale <avon@flatlet.net>, the casting of NULL to (void *)
in the execl call is to make sure it is 64 bit on 64 bit archs.

Not verified by myself since I have no 64bit arch to test on.

Patch provided in private email.

Log message:
* Use buildlink2.
* Install some documentation.
* Honor PKG_SYSCONFDIR (and warn user that the config file directory may
  have changed).
* Allow for compiling with OSS support on NetBSD, though it is currently
  commented out.