howto: kernel 2.6.31 and mount.cifs?

I am looking for a way to get this to work: mount with the 2.6.31
kernel to a windows share

uname -a:
Linux off-xen-hq 2.6.31-gentoo-r6 #3 SMP Fri Jan 8 09:43:46 GMT 2010
x86_64 Intel(R) Xeon(R) CPU X5560 @ 2.80GHz GenuineIntel GNU/Linux

emerge -s mount-cifs:
Searching...
[ Results for search key : mount-cifs ]
[ Applications found : 1 ]

*  net-fs/mount-cifs
      Latest version available: 3.0.30
      Latest version installed: 3.0.30
      Size of files: 23 kB
      Homepage:      http://linux-cifs.samba.org/cifs/cifs_download.html
      Description:   cifs filesystem mount helper split from Samba
      License:       GPL-2

somehow its not working, also in the kernel I cannot find anything
related to samba of cifs
I get:
mount error: cifs filesystem not supported by the system

with the following command:
su -c'mount.cifs //WINDOWES/share /mnt/share -o
credentials=/root/.smbcredentials,iocharset=utf8,file_mode=0777,dir_mode=0777'



thanks,

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