SoXtGLWidget could not get satisfactory visual for GLX about soxt HOT 4 CLOSED

I forgot to say I'm using SoXt release 1.4.0

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Also I should have said the error occurs when the program is creating an SoXtExaminerViewer.

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I found the code in SoXtGLWidget that selects the visual. I replicated that in my program, and found that glxChooseVisual() never returns a visual. I tried removing all attributes so it should return any GLX visual, but still nothing. xdpyinfo shows the GLX extension (see below), and as originally posted, glxinfo shows plenty of visuals.

For a sanity check I tried running glxgears and that does work, so XQuartz GLX support can't be completed broken...

name of display: :0
version number: 11.0
vendor string: The X.Org Foundation
vendor release number: 11907000
X.Org version: 1.19.7
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: 7
supported pixmap formats:
depth 1, bits_per_pixel 1, scanline_pad 32
depth 4, bits_per_pixel 8, scanline_pad 32
depth 8, bits_per_pixel 8, scanline_pad 32
depth 15, bits_per_pixel 16, scanline_pad 32
depth 16, bits_per_pixel 16, scanline_pad 32
depth 24, bits_per_pixel 32, scanline_pad 32
depth 32, bits_per_pixel 32, scanline_pad 32
keycode range: minimum 8, maximum 255
focus: None
number of extensions: 23
Apple-DRI
Apple-WM
BIG-REQUESTS
DAMAGE
DOUBLE-BUFFER
GLX
Generic Event Extension
MIT-SCREEN-SAVER
MIT-SHM
Present
RANDR
RENDER
SECURITY
SGI-GLX
SHAPE
SYNC
X-Resource
XC-MISC
XFIXES
XINERAMA
XInputExtension
XKEYBOARD
XVideo
default screen number: 0
number of screens: 1

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Ok, I figured it out testing with the glxgears source code.

Homebrew apparently installed versions of Xt and X11. If I compile linked against the homebrew installed versions, glxChooseVisual always returns null. If I force linkage with the XQuartz versions, then glxChooseVisual works.

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