gcc -c ddu2.c
gcc -c ddu3.c
gcc -c ddu4.c
gcc -c ddu5.c
gcc -o eth2read eth2read.c ddu2.o
gcc -o eth3read eth3read.c ddu3.o
gcc -o eth4read eth4read.c ddu4.o
gcc -o eth5read eth5read.c ddu5.o
