A number of packages adds -pthread to the flags passed to gcc.  The
gcc in NetBSD 1.6 does not handle -pthread, but that has not been
much of a problem since it ignores this flag, and -lpthread are
often present in addition to the -pthread.

Recent changes to pkgsrc infrastructure does however seem to
remove -lpthread when -pthread is present, with the result that
build of those packages (e.g. sysutils/bacula and www/privoxy)
now fails.

What is the correct way of fixing those packages?  Patch away the
-pthread and set some magic pkgsrc option?  Or are there other
mechanisms?  Or is this a bug in pkgsrc?

    /Krister