Apparently you need gcc 4.7 or newer for this stuff.

dlib/CMakeLists.txt

@@ -409,7 +409,7 @@ if (NOT TARGET dlib)
          find_package(CUDA 7.0)
 
 
-         if (CUDA_FOUND)
+         if (CUDA_FOUND AND COMPILER_CAN_DO_CPP_11)
 
             set(CUDA_HOST_COMPILATION_CPP ON)
             # Note that we add __STRICT_ANSI__ to avoid freaking out nvcc with gcc specific

dlib/use_cpp_11.cmake

@@ -24,10 +24,6 @@ if (CMAKE_VERSION VERSION_LESS "3.1")
          message(STATUS "C++11 activated.")
          add_global_compiler_switch("-std=gnu++11")
          set(COMPILER_CAN_DO_CPP_11 1)
-      elseif(GCC_VERSION VERSION_GREATER 4.3 OR GCC_VERSION VERSION_EQUAL 4.3)
-         message(STATUS "C++0x activated.")
-         add_global_compiler_switch("-std=gnu++0x")
-         set(COMPILER_CAN_DO_CPP_11 1)
       endif()
    elseif ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang")
       execute_process( COMMAND ${CMAKE_CXX_COMPILER} --version OUTPUT_VARIABLE clang_full_version_string )