cmake ImgTec

GLM: GCC - GNU compiler
CMake Warning at external/glm/src/CMakeLists.txt:282 (export):
  Cannot create package registry file:

    /home/debian/.cmake/packages/glm/22ccf9871dea1590bd13d3fa2b6720c3

  Permission denied



CMake Error at /usr/share/cmake-3.7/Modules/FindX11.cmake:429 (message):
  Could not find X11
Call Stack (most recent call first):
  framework/PVRShell/CMakeLists.txt:91 (find_package)


-- Configuring incomplete, errors occurred!