Suppressing the swrast error message

I'm using XQuartz on MacOS as the local server, with the remote client 
running Ubuntu on old iMac hardware (with Intel graphics; some of 
glxinfo from the remote system shown below).

The remote system doesn't have a swrast driver, so I get the error message

   libGL error: failed to load driver: swrast

every time an application first tries to open a window.  Is there a way 
to suppress this message?

Duncan Murdoch

Here's the beginning of glxinfo on the remote system:

name of display: localhost:10.0
libGL error: No matching fbConfigs or visuals found
libGL error: failed to load driver: swrast
display: localhost:10  screen: 0
direct rendering: No (If you want to find out why, try setting 
LIBGL_DEBUG=verbose)
server glx vendor string: SGI
server glx version string: 1.4
server glx extensions:
     GLX_ARB_multisample, GLX_EXT_import_context, GLX_EXT_visual_info,
     GLX_EXT_visual_rating, GLX_OML_swap_method, GLX_SGIS_multisample,
     GLX_SGIX_fbconfig
client glx vendor string: Mesa Project and SGI
client glx version string: 1.4
client glx extensions:
     GLX_ARB_context_flush_control, GLX_ARB_create_context,
     GLX_ARB_create_context_no_error, GLX_ARB_create_context_profile,
     GLX_ARB_create_context_robustness, GLX_ARB_fbconfig_float,
     GLX_ARB_framebuffer_sRGB, GLX_ARB_get_proc_address, 
GLX_ARB_multisample,
     GLX_EXT_buffer_age, GLX_EXT_create_context_es2_profile,
     GLX_EXT_create_context_es_profile, GLX_EXT_fbconfig_packed_float,
     GLX_EXT_framebuffer_sRGB, GLX_EXT_import_context,
     GLX_EXT_texture_from_pixmap, GLX_EXT_visual_info, 
GLX_EXT_visual_rating,
     GLX_INTEL_swap_event, GLX_MESA_copy_sub_buffer,
     GLX_MESA_multithread_makecurrent, GLX_MESA_query_renderer,
     GLX_MESA_swap_control, GLX_OML_swap_method, GLX_OML_sync_control,
     GLX_SGIS_multisample, GLX_SGIX_fbconfig, GLX_SGIX_pbuffer,
     GLX_SGIX_visual_select_group, GLX_SGI_make_current_read,
     GLX_SGI_swap_control, GLX_SGI_video_sync
GLX version: 1.4
GLX extensions:
     GLX_ARB_get_proc_address, GLX_ARB_multisample, GLX_EXT_import_context,
     GLX_EXT_visual_info, GLX_EXT_visual_rating, GLX_OML_swap_method,
     GLX_SGIS_multisample, GLX_SGIX_fbconfig, GLX_SGIX_pbuffer,
     GLX_SGI_make_current_read
OpenGL vendor string: Intel Inc.
OpenGL renderer string: Intel(R) HD Graphics 6000
OpenGL version string: 1.4 (2.1 INTEL-10.36.26)