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+<HTML>
+
+<TITLE>Environment Variables</TITLE>
+
+<link rel="stylesheet" type="text/css" href="mesa.css"></head>
+
+<BODY>
+
+<H1>Environment Variables</H1>
+
+<p>
+Mesa supports the following environment variables:
+</p>
+<ul>
+<li>MESA_NO_ASM - if set, disables all assembly language optimizations
+<li>MESA_NO_MMX - if set, disables Intel MMX optimizations
+<li>MESA_NO_3DNOW - if set, disables AMD 3DNow! optimizations
+<li>MESA_NO_SSE - if set, disables Intel SSE optimizations
+<li>MESA_DEBUG - if set, error messages are printed to stderr.
+If the value of MESA_DEBUG is "FP" floating point arithmetic errors will
+generate exceptions.
+<li>MESA_NO_DITHER - if set, disables dithering, overriding glEnable(GL_DITHER)
+</ul>
+
+<p>
+The following environment variables are only applicable to the Xlib/X11
+software driver.
+See the <A HREF="README.X11">README.X11</A> file for details.
+</p>
+<ul>
+<li>MESA_RGB_VISUAL - specifies the X visual and depth for RGB mode
+<li>MESA_CI_VISUAL - specifies the X visual and depth for CI mode
+<li>MESA_BACK_BUFFER - specifies how to implement the back color buffer,
+    either "pixmap" or "ximage"
+<li>MESA_GAMMA - gamma correction coefficients for red, green, blue channels
+<li>MESA_XSYNC - enable synchronous X behavior (for debugging only)
+<li>MESA_GLX_FORCE_CI - if set, force GLX to treat 8bpp visuals as CI visuals
+<li>MESA_GLX_FX - set to either "fullscreen" for full-screen rendering,
+  "window" to render into a window, or "disable" to disable the Glide driver.
+<li>MESA_GLX_FORCE_ALPHA - if set, forces RGB windows to have an alpha channel.
+<li>MESA_GLX_DEPTH_BITS - specifies default number of bits for depth buffer.
+</ul>
+
+
+</BODY>
+</HTML>