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diff --git a/docs/envvars.rst b/docs/envvars.rst
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@@ -224,12 +224,8 @@ the :doc:`Xlib software driver page <xlibdriver>` for details.
:envvar:`MESA_BACK_BUFFER`
specifies how to implement the back color buffer, either ``pixmap``
or ``ximage``
-:envvar:`MESA_GAMMA`
- gamma correction coefficients for red, green, blue channels
:envvar:`MESA_XSYNC`
enable synchronous X behavior (for debugging only)
-:envvar:`MESA_GLX_FORCE_CI`
- if set, force GLX to treat 8 BPP visuals as CI visuals
:envvar:`MESA_GLX_FORCE_ALPHA`
if set, forces RGB windows to have an alpha channel.
:envvar:`MESA_GLX_DEPTH_BITS`