build regression, GLX_RGBA_FLOAT_BIT_ARB undeclared?

[Dan Kegel]

I just did a git pull, and compilation is failing with
opengl.c:676: error: 'GLX_RGBA_FLOAT_BIT_ARB' undeclared (first use in
this function)
I think that symbol reference was added just today:
http://winehq.org/pipermail/wine-cvs/2007-July/034660.html
and is supposed to come from glext.h.
Do we need some #ifdef action here?

I'm developing on dapper.
$ cat /etc/issue
Ubuntu 6.06.1 LTS \n \l
$ dpkg-query -S glext.h
mesa-common-dev: /usr/include/GL/glext.h
$ dpkg-query -W mesa-common-dev
mesa-common-dev 6.4.1-0ubuntu8