Ubuntu 12.04 an g2o, fixed -std=c++11 error

CMakeLists.txt

@@ -202,6 +202,22 @@ IF(WITH_GTSAM)
     FIND_PACKAGE(GTSAM QUIET)
 ENDIF(WITH_GTSAM)
 
+IF(G2O_FOUND OR GTSAM_FOUND)
+   #Newest versions require std11
+   IF(NOT MSVC)
+     include(CheckCXXCompilerFlag)
+	  CHECK_CXX_COMPILER_FLAG("-std=c++11" COMPILER_SUPPORTS_CXX11)
+	  CHECK_CXX_COMPILER_FLAG("-std=c++0x" COMPILER_SUPPORTS_CXX0X)
+	  IF(COMPILER_SUPPORTS_CXX11)
+		set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
+	  ELSEIF(COMPILER_SUPPORTS_CXX0X)
+		set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++0x")
+	  ELSE()
+		message(STATUS "The compiler ${CMAKE_CXX_COMPILER} has no C++11 support. Please use a different C++ compiler if you want to use g2o or gtsam (set \"-DWITH_G2O=OFF -DWITH_GTSAM=OFF\" to build without g2o and gtsam).")
+	  ENDIF()
+   ENDIF()
+ENDIF(G2O_FOUND OR GTSAM_FOUND)
+
 IF(WITH_FLYCAPTURE2)
     FIND_PACKAGE(FlyCapture2 QUIET)
     IF(FlyCapture2_FOUND)

cmake_modules/FindG2O.cmake

@@ -79,4 +79,6 @@ IF(G2O_STUFF_LIBRARY AND G2O_CORE_LIBRARY AND G2O_INCLUDE_DIR AND G2O_SOLVERS_FO
 	${CSPARSE_LIBRARY}
         cholmod)
   SET(G2O_FOUND "YES")
-ENDIF(G2O_STUFF_LIBRARY AND G2O_CORE_LIBRARY AND G2O_INCLUDE_DIR AND G2O_SOLVERS_FOUND AND CSPARSE_FOUND)
+ELSEIF(G2O_STUFF_LIBRARY AND G2O_CORE_LIBRARY AND G2O_INCLUDE_DIR)
+  MESSAGE(STATUS "g2o core libraries found but some solvers are missing. Make sure to install \"libsuitesparse-dev\" before building/installing g2o.")
+ENDIF(G2O_STUFF_LIBRARY AND G2O_CORE_LIBRARY AND G2O_INCLUDE_DIR)

corelib/src/CMakeLists.txt

@@ -153,8 +153,6 @@ IF(G2O_FOUND)
 		${LIBRARIES}
 		${G2O_LIBRARIES}
 	)
-	#Newest versions require std11
-	SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
 	
 	SET(SRC_FILES
     	${SRC_FILES}