According to the press release:
Previous SGI contributions to the free and open source community
are now available under the new license. These contributions
include the SGI® OpenGL® Sample Implementation, the GLX™ API and
other GLX extensions.
[...]
"SGI has been one of the most ardent commercial supporters of free
and open source software, so it was important to us that we continue
to support the free software development community by releasing our
earlier OpenGL-related contributions under this new license," said
Steve Neuner, director of Linux, SGI. "This license ensures that all
existing user communities will benefit, and their work can proceed
unimpeded. Both Mesa and the X.org Project can continue to utilize
this code in free software distributions of GNU/Linux. Now more than
ever, software previously released by SGI under earlier GLX and SGI
Free Software License B is free."
"The GLX API" is here read to include the original GLX source release
from:
http://www.sgi.com/products/software/opensource/glx/download.html
ftp://ftp.sgi.com/sgi/opengl/glx/glx1_2.1.tgz
which includes glxext.c as included in XFree86, from which our copies
in glx/ and hw/dmx/glxProxy/ are derived.
GLX is enabled by default, but the current swrast behaviour causes X
to abort with fatal error if the swrast dri library dlopen fails.
Handle the case where the swrast library is not present, and do not
register the GLX extension unless at least one screen has a usable
GL provider.
