Package breaks unity with i915 because GLX cannot be loaded

When nvidia-graphics-drivers-319-updates is installed I cannot log in into Unity because GLX cannot be loaded:

From Xorg.0.log:
[ 4872.070] (EE) Failed to initialize GLX extension (Compatible NVIDIA X driver not found)

This somewhat makes sense, because I do not have a NVIDIA card, but rather this:

00:02.0 VGA compatible controller: Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller (rev 07) (prog-if 00 [VGA controller])
        Subsystem: Lenovo Device 20e4
        Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
        Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
        Latency: 0
        Interrupt: pin A routed to IRQ 45
        Region 0: Memory at f2000000 (64-bit, non-prefetchable) [size=4M]
        Region 2: Memory at d0000000 (64-bit, prefetchable) [size=256M]
        Region 4: I/O ports at 1800 [size=8]
        Expansion ROM at <unassigned> [disabled]
        Capabilities: [90] MSI: Enable+ Count=1/1 Maskable- 64bit-
                Address: fee0300c Data: 4152
        Capabilities: [d0] Power Management version 3
                Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
                Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
        Kernel driver in use: i915

Once nvidia-graphics-drivers-319-updates is removed I can log in to Unity again. XFCE would work fine even with the package installed, but GLX would not be available.

The reason nvidia-graphics-drivers-319-updates was installed is because I need libopencv-dev, which depends on nvidia-graphics-drivers-319-updates.

So the problem is either that libopencv-dev depends on nvidia-graphics-drivers-319-updates, or that nvidia-graphics-drivers-319-updates breaks logging in with the Intel i915 card.

ProblemType: Bug
DistroRelease: Ubuntu 13.10
Package: nvidia-319-updates (not installed)
ProcVersionSignature: Ubuntu 3.11.0-12.19-generic 3.11.3
Uname: Linux 3.11.0-12-generic x86_64
ApportVersion: 2.12.5-0ubuntu2
Architecture: amd64
Date: Thu Oct 24 15:18:49 2013
EcryptfsInUse: Yes
InstallationDate: Installed on 2013-01-25 (272 days ago)
InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.5)
MarkForUpload: True
SourcePackage: nvidia-graphics-drivers-319-updates
UpgradeStatus: Upgraded to saucy on 2013-09-28 (25 days ago)