courier compilation output

gistfile1.txt

/bin/bash ./libtool  --tag=CXX   --mode=link g++  -Wall -I./.. -I.. -I../libs -I./../libs -I./libs -g -O2    -o couriermlm cmlm.o cmlm2.o cmlm3.o cmlmarchive.o cmlmbounce.o cmlmcleanup.o cmlmcmdmisc.o cmlmdigest.o cmlmfetch.o cmlmfilter.o cmlmmoderate.o cmlmstartmail.o cmlmsublist.o cmlmsubunsub.o cmlmsubunsubmsg.o ../afx/libafx.a ../libs/rfc2045/librfc2045.la ../libs/rfc822/librfc822.la ../libs/liblock/liblock.la ../libs/random128/librandom128.la ../libs/md5/libmd5.la ../libs/numlib/libnumlib.la ../libs/gdbmobj/libgdbmobj.la -lcourier-unicode
libtool: link: g++ -Wall -I./.. -I.. -I../libs -I./../libs -I./libs -g -O2 -o couriermlm cmlm.o cmlm2.o cmlm3.o cmlmarchive.o cmlmbounce.o cmlmcleanup.o cmlmcmdmisc.o cmlmdigest.o cmlmfetch.o cmlmfilter.o cmlmmoderate.o cmlmstartmail.o cmlmsublist.o cmlmsubunsub.o cmlmsubunsubmsg.o  ../afx/libafx.a ../libs/rfc2045/.libs/librfc2045.a ../libs/rfc822/.libs/librfc822.a -lidn ../libs/liblock/.libs/liblock.a ../libs/random128/.libs/librandom128.a ../libs/md5/.libs/libmd5.a ../libs/numlib/.libs/libnumlib.a ../libs/gdbmobj/.libs/libgdbmobj.a -lgdbm -lcourier-unicode
cmlmsubunsub.o: In function `std::char_traits<char>::length(char const*)':
/usr/include/c++/6/bits/char_traits.h:267: undefined reference to `unicode::utf_8'