This should be a blocker / exception, if someone can set one
of those flags.

Reproduce:
Version-Release number of selected component: libguestfs-1.20.10-2.el6.x86_64
1. [host]#guestfish --version
libguestfs: trace: version
libguestfs: trace: version = <struct guestfs_version *>
guestfish 1.20.10rhel=6,release=2.el6
libguestfs: trace: close

2. [host]#guestfish -h | grep 9p
list-9p              list 9p filesystems
mount-9p             mount 9p filesystem
libguestfs: trace: close


Verified:
Version-Release number of selected component: libguestfs-1.20.10-3.el6.x86_64.rpm
1. [host]#guestfish --version
libguestfs: trace: version
libguestfs: trace: version = <struct guestfs_version *>
guestfish 1.20.10rhel=6,release=3.el6
libguestfs: trace: close

2. [host]#guestfish -h | grep 9p
libguestfs: trace: close

No list-9p and mount-9p.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

http://rhn.redhat.com/errata/RHSA-2013-1536.html