Compiling as a module using the 2.6.25 git tree

Hello,

A question about compiling as module using the 2.6.25 git tree:
I had git cloned the 2.6.25 DaveM tree.
I ran "make menuconfig".
In many cases I see in the help:
"To compile this code as a module, choose M here: the
 module will be called ..."
For example, in "Packet Generator" or in 802.1d Etherent Bridging
(CONFIG_BRIDGE).

However, I cannot choose 'M' here ; the toggle is only between
building into the kernel ('*')
or not.

BRIDGE depends (according to the help) only on CONFIG_NET and I have
CONFIG_NET selected.
more .config | grep  CONFIG_INET
CONFIG_INET=y

Also llc is configured: (though in fact bridge selects llc).
more .config | grep LLC
CONFIG_LLC=y
CONFIG_LLC2=y

And in the Kconfig file we have:
config BRIDGE
        tristate "802.1d Ethernet Bridging"


When I try "make menuconfig" on the kernel of a distro (like FC8) I
**can** choose
bridge as a module. (I see it as 'M').

Any ideas why? Is is something due to using the git tree?

Mark