# cp $(LINUX_DIR)/lib/math/mean_and_variance.c linux/
# git add linux/mean_and_variance.c
# cp $(LINUX_DIR)/include/linux/mean_and_variance.h include/linux/
# cp $(LINUX_DIR)/lib/math/mean_and_variance.c linux/
# git add linux/mean_and_variance.c
# cp $(LINUX_DIR)/include/linux/mean_and_variance.h include/linux/