无CXX 咨询官网说木得g++ c++ 没有相应的devtoolset  

[root@localhost build]# cmake .. -DPY_VERSION=3 -DPYTHON_EXECUTABLE=`which python3` -DWITH_MIPS=ON -DWITH_TESTING=OFF -DCMAKE_BUILD_TYPE=Release -DON_INFER=ON -DWITH_XBYAK=OFF -DWITH_MKL=OFF
-- Found Paddle host system: , version:
-- Found Paddle host system's CPU: 8 cores
-- The CXX compiler identification is unknown
CMake Error at CMakeLists.txt:36 (project):
No CMAKE_CXX_COMPILER could be found.

Tell CMake where to find the compiler by setting either the environment
variable "CXX" or the CMake cache entry CMAKE_CXX_COMPILER to the full path
to the compiler, or to the compiler name if it is in the PATH.
查找 g++  c++
[root@localhost build]# which c++
which: no c++ in (/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/root/bin:/root/bin)
[root@localhost build]# which g++
which: no g++ in (/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/root/bin:/root/bin)
  不晓得怎么搞 请趟过坑的前辈指导一下