Bug#632750: nvidia-glx: conflicts with libgl1-mesa-swx11

[SC]

Package: nvidia-glx
Version: 275.09.07-1
Severity: important

I can't quite figure this one out, but it seems the current version of nvidia-glx is incompatible with the current version of libgl1-nvidia-glx in Wheezy.

Output of apt-get install nvidia-glx:
The following packages have unmet dependencies:
 nvidia-glx : Depends: libgl1-nvidia-glx (= 275.09.07-1)
E: Broken package

Output of apt-get install libgl1-nvidia-glx:
The following packages have unmet dependencies:
 libgl1-nvidia-glx : Depends: libgl1-nvidia-alternatives but it is not going to be installed
E: Broken packages

Trying to install libgl1-nvidia-alternatives removes most X-related packages, which I certainly don't want! aptitude why-not nvidia-glx shows the following:
i   xorg              Depends   libgl1-mesa-glx | libgl1
p   libgl1-mesa-swx11 Provides  libgl1                  
p   libgl1-mesa-swx11 Conflicts nvidia-glx

What is the issue here?

-- System Information:
Debian Release: wheezy/sid
  APT prefers testing
  APT policy: (500, 'testing')
Architecture: i386 (i686)

Kernel: Linux 2.6.39-2-686-pae (SMP w/2 CPU cores)
Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash