Sorry, forgot to mention that you should copy the files into libcarddav-0.6.2/ instead of admin. Also, you shouldn't run the make -f admin command.
FTBFS.
Here is what I ran:
find ./ -name Makefile.in -exec rm -f {} ; cp -p /usr/share/aclocal/libtool.m4 ./libtool.m4.in cp -p /usr/share/libtool/ltmain.sh ./ltmain.sh ./autogen.sh