i am trying to use a makefile

this is the one i am using
i need to add ~erbacher/crypt.o
and i dont know how to do that
it is a file our teacher put on the system becouse
the one there doesnt work
how do i add this to this makefile

ive been using
gcc main.c ~erbacher/crypt.o -lsocket -lnsl

manualy and it works fine but i cant figure out
how to put it into the makefile

.SUFFIXES: .c .o
CC = gcc
$(CC) $(CFLAGS) -c $<
all: co 402connect
402connect: main.o
gcc -lsocket -lnsl main.o -o 402connect
rm -f *.o core
co main.c

please help if u can