Ups, I didn't activate user contrib repository of siduction. As Towo pointed to me, now:
ii libegl1-nvidia:amd64 340.24-0.siduction.1 amd64 NVIDIA binary EGL libraries
ii libgl1-nvidia-glx:amd64 340.24-0.siduction.1 amd64 NVIDIA binary OpenGL libraries
ii libgles2-nvidia:amd64 340.24-0.siduction.1 amd64 NVIDIA binary OpenGL|ES 2.x libraries
ii libnvidia-eglcore:amd64 340.24-0.siduction.1 amd64 NVIDIA binary EGL core libraries
ii libnvidia-ml1:amd64 340.24-0.siduction.1 amd64 NVIDIA Management Library (NVML) runtime library
ii libxnvctrl0 340.17-0.siduction.1 amd64 NV-CONTROL X extension (runtime library)
ii nvidia-alternative 340.24-0.siduction.1 amd64 allows the selection of NVIDIA as GLX provider
ii nvidia-detect 340.24-0.siduction.1 amd64 NVIDIA GPU detection utility
ii nvidia-driver 340.24-0.siduction.1 amd64 NVIDIA metapackage
ii nvidia-glx 340.24-0.siduction.1 amd64 transition to nvidia-driver
ii nvidia-kernel-dkms 340.24-0.siduction.1 amd64 NVIDIA binary kernel module DKMS source
ii nvidia-settings 340.17-0.siduction.1 amd64 tool for configuring the NVIDIA graphics driver
ii nvidia-smi 340.24-0.siduction.1 amd64 NVIDIA System Management Interface
ii nvidia-vdpau-driver:amd64 340.24-0.siduction.1 amd64 NVIDIA vdpau driver
ii xserver-xorg-video-nvidia 340.24-0.siduction.1 amd64 NVIDIA binary Xorg driver
The new nvidia-340.24 proprietary driver also runs with xorg-1.15
I proved using my Gentoo partition.