[exim] compile errors on AMD64

from make

[snip]

awk '{ print ($1+1) }' cnumber.h > cnumber.temp
rm -f cnumber.h; mv cnumber.temp cnumber.h
gcc -c -O -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -I/usr/include/db4 
  -I/usr/local/ssl/include/ version.c
rm -f exim
gcc -o exim  acl.o child.o crypt16.o daemon.o dbfn.o debug.o deliver.o 
directory.o dns.o drtables.o enq.o exim.o expand.o filter.o filtertest.o 
globals.o header.o host.o ip.o log.o lss.o match.o moan.o os.o parse.o 
queue.o rda.o readconf.o receive.o retry.o rewrite.o rfc2047.o route.o 
search.o sieve.o smtp_in.o smtp_out.o spool_in.o spool_out.o store.o 
string.o tls.o tod.o transport.o tree.o verify.o local_scan.o  malware.o 
mime.o regex.o spam.o spool_mbox.o demime.o bmi_spam.o spf.o srs.o dk.o 
version.o \
   pcre/libpcre.a \
   routers/routers.a transports/transports.a lookups/lookups.a \
   auths/auths.a \
   -lresolv -lnsl -lcrypt    \
    -ldb4 -L/usr/local/lib/ldap -lldap -llber   \
    -L/usr/local/ssl/lib -lssl -lcrypto
/usr/local/ssl/lib/libcrypto.a(dso_dlfcn.o)(.text+0x4f): In function 
`dlfcn_load':
: undefined reference to `dlopen'
/usr/local/ssl/lib/libcrypto.a(dso_dlfcn.o)(.text+0xe7): In function 
`dlfcn_load':
: undefined reference to `dlclose'
/usr/local/ssl/lib/libcrypto.a(dso_dlfcn.o)(.text+0x14d): In function 
`dlfcn_unload':
: undefined reference to `dlclose'
/usr/local/ssl/lib/libcrypto.a(dso_dlfcn.o)(.text+0x20c): In function 
`dlfcn_bind_var':
: undefined reference to `dlsym'
/usr/local/ssl/lib/libcrypto.a(dso_dlfcn.o)(.text+0x2dc): In function 
`dlfcn_bind_func':
: undefined reference to `dlsym'
collect2: ld returned 1 exit status
make[1]: *** [exim] Error 1
make[1]: Leaving directory `/home/exim/exim-4.51/build-Linux-x86_64'
make: *** [go] Error 2

any clues??

--
========

Regards

Ronan McGlue
Info. Services
QUB