dhcpd error during image file generation in uClinux

This is what i get when i compile the dhcpd folder

root@localhost dhcpd]# make clean
rm -f dhcpd *.elf *.gdb *.o
# make all
cc    -c -o dhcpd.o dhcpd.c
cc    -c -o arpping.o arpping.c
cc    -c -o socket.o socket.c
cc    -c -o options.o options.c
options.c: In function ‘addOption’:
options.c:17: warning: incompatible implicit declaration of built-in function ‘memcpy’
options.c: In function ‘add_multiple_option’:
options.c:35: warning: incompatible implicit declaration of built-in function ‘memcpy’
options.c: In function ‘addOptionMulti’:
options.c:63: warning: incompatible implicit declaration of built-in function ‘memcpy’
cc    -c -o files.o files.c
cc    -c -o debug.o debug.c
cc    -c -o nettel.o nettel.c
cc  -o dhcpd dhcpd.o arpping.o socket.o options.o files.o debug.o nettel.o