The Debug output is :

(II) [KMS] Kernel modesetting enabled.
libEGL debug: Native platform type: drm (environment overwrite)
libEGL debug: ignore EGL_DRIVERS_PATH for setuid/setgid binaries
libEGL debug: EGL search path is /home/atitest/install/lib/egl
libEGL debug: added /home/atitest/install/lib/egl/egl_gallium.so to module
array
libEGL debug: added egl_dri2 to module array
libEGL debug: added egl_glx to module array
libEGL debug: dlopen(/home/atitest/install/lib/egl/egl_gallium.so)
libEGL info: use DRM for display 0x1b741d0
libEGL debug: EGL user error 0x3001 (EGL_NOT_INITIALIZED) in eglInitialize(no
usable display)
libEGL info: use DRM for display 0x1b741d0
libEGL debug: EGL user error 0x3001 (EGL_NOT_INITIALIZED) in eglInitialize(no
usable display)
libEGL debug: EGL user error 0x3001 (EGL_NOT_INITIALIZED) in eglInitialize
(EE) RADEON(0): eglInitialize() failed
(EE) RADEON(0): glamor detected, failed to initialize EGL.
X: /home/atitest/work/llvm/include/llvm/Support/CommandLine.h:674: void
llvm::cl::parser<llvm::ScheduleDAGInstrs *(*)(llvm::MachineSchedContext
*)>::addLiteralOption(const char *, const DT &, const char *) [DataType =
llvm::ScheduleDAGInstrs *(*)(llvm::MachineSchedContext *), DT =
llvm::ScheduleDAGInstrs *(*)(llvm::MachineSchedContext *)]: Assertion
`findOption(Name) == Values.size() && "Option already exists!"' failed.
xinit: giving up
xinit: unable to connect to X server: Connection refused
xinit: server error