compile error with gcc + MPICH

[wyfSunflower]

make MPICXX=mpic++ CXX=g++ mpic++ -cxx=g++ -fopenmp --std=c++11 -I/usr/include/mpi/ -I./include -I./include/GMDP -O3 -flto -fwhole-program -march=native -o bin/BFS src/BFS.cpp -lboost_serialization g++: error: unrecognized command-line option ‘-cxx=g++’ make: *** [Makefile:54: bin/BFS] Error 1