nVidia gamework opengl samples build error

./../../../extensions/externals/lib/linux64/libglfw3.a(x11_gamma.c.o): In function `_glfwInitGammaRamp':

x11_gamma.c:(.text+0x49): undefined reference to `XRRGetScreenResources'

====================================================

linux ubuntu 14.04

1. cd /usr/bin/
2. sudo rm ld
3. sudo ln -s ld.gold ld