terminal.app fails with "Unrecognized color masks" on x4vncserver with -depth 16 (Ubuntu 8.04)

[Stephane Gourichon]

Hello,

I write to you after an error message that invites me to send a report.
A quick search on Google returns nothing relevant.

Description : I launch terminal.app on a vnc4server with depth 16. 
Answer is :
> $ Terminal
> 2008-09-04 12:38:27.489 Terminal[18376] gnustep-back(art): 
> Unrecognized color masks: 0000003f:000007c0:0000f800 16
> 2008-09-04 12:38:27.546 Terminal[18376] Please report this along with 
> details on your pixel format (ie. the four numbers above) to 
> bug-gnustep@gnu.org.Better: implement it and send a patch.)
System is a new Ubuntu 8.04 server.
X server is vnc4server

Xvnc arguments include :  -depth 16 -pn -extension XFIXES -dpi 72 
(unrelated arguments like adress and port number removed)

If you wish any more details please ask.
xdpyinfo output below, just in case.

Thank you for your attention.

-- Stéphane Gourichon

stephane@valmont:~$ xdpyinfo
name of display:    :2.0
version number:    11.0
vendor string:    The X.Org Foundation
vendor release number:    70000000
X.Org version: 7.0.0
maximum request size:  16777212 bytes
motion buffer size:  256
bitmap unit, bit order, padding:    32, LSBFirst, 32
image byte order:    LSBFirst
number of supported pixmap formats:    2
supported pixmap formats:
   depth 1, bits_per_pixel 1, scanline_pad 32
   depth 16, bits_per_pixel 16, scanline_pad 32
keycode range:    minimum 8, maximum 255
focus:  window 0xc0000f, revert to Parent
number of extensions:    20
   BIG-REQUESTS
   DAMAGE
   DEC-XTRAP
   DOUBLE-BUFFER
   Extended-Visual-Information
   MIT-SCREEN-SAVER
   MIT-SHM
   MIT-SUNDRY-NONSTANDARD
   RECORD
   SECURITY
   SHAPE
   SYNC
   TOG-CUP
   VNC-EXTENSION
   X-Resource
   XC-APPGROUP
   XC-MISC
   XFree86-Bigfont
   XTEST
   XVideo
default screen number:    0
number of screens:    1

screen #0:
 dimensions:    1152x864 pixels (406x305 millimeters)
 resolution:    72x72 dots per inch
 depths (2):    1, 16
 root window id:    0x25
 depth of root window:    16 planes
 number of colormaps:    minimum 1, maximum 1
 default colormap:    0x20
 default number of colormap cells:    64
 preallocated pixels:    black 0, white 65535
 options:    backing-store YES, save-unders YES
 largest cursor:    1152x864
 current input event mask:    0xda403f
   KeyPressMask             KeyReleaseMask           
ButtonPressMask         
   ButtonReleaseMask        EnterWindowMask          
LeaveWindowMask         
   KeymapStateMask          StructureNotifyMask      
SubstructureNotifyMask  
   SubstructureRedirectMask PropertyChangeMask       
ColormapChangeMask      
 number of visuals:    2
 default visual id:  0x21
 visual:
   visual id:    0x21
   class:    TrueColor
   depth:    16 planes
   available colormap entries:    64 per subfield
   red, green, blue masks:    0xf800, 0x7e0, 0x1f
   significant bits in color specification:    8 bits
 visual:
   visual id:    0x22
   class:    DirectColor
   depth:    16 planes
   available colormap entries:    64 per subfield
   red, green, blue masks:    0x3f, 0x7c0, 0xf800
   significant bits in color specification:    8 bits