[FTBFS] Package ddns3-client 1.8-7 in natty

http://people.ubuntuwire.org/~lucas/ubuntu-nbs/32/ddns3-client_1.8-7_lubuntu32.buildlog

Binary package hint: ddns3-client

md5.h:17:6: note: expected 'unsigned char *' but argument is of type 'char *'
gcc -Wall -g -O2 -c -o auth.o auth.c
gcc -Wall -g -O2 -c -o md5.o md5.c
gcc -Wall -g -O2 -c -o ctx.o ctx.c
ar -cr libddns3.a *.o
ranlib libddns3.a
gcc -Wall -g -O2 -lcrypt ddns3.c libddns3.a -o ddns3
libddns3.a(crypto.o): In function `ddns3_crypto_crypt':
/build/user-ddns3-client_1.8-7-i386-XILqxH/ddns3-client-1.8/crypto.c:52: undefined reference to `crypt'
collect2: ld returned 1 exit status
make[1]: *** [ddns3] Error 1
make[1]: Leaving directory `/build/user-ddns3-client_1.8-7-i386-XILqxH/ddns3-client-1.8'
make: *** [build-stamp] Error 2
dpkg-buildpackage: error: debian/rules build gave error exit status 2