getting error when using c++ dll in python

Question

this is my makefile

CXX = g++
CXXFLAGS = -std=c++2a   -O3  -I./h  -c
CLLFLAGS = -std=c++2a   -O3  -I./h  -fPIC -shared
LXXFLAGS = -std=c++2a    -I./h -pthread