compiling lftp on 64-bit Fedora

Hi,

Make fails with:

/bin/sh ../libtool --silent --tag=CXX --mode=link gcc  -O2 -Wall
-Wwrite-strings -Woverloaded-virtual -fno-exceptions -fno-rtti
-fno-implement-inlines -Winline  -s -o lftp  lftp.o complete.o
lftp_rl.o liblftp-jobs.la -lreadline -lutil -lcurses -ldl -lsupc++
/usr/lib/libexpat.so: could not read symbols: File in wrong format

presumably because it's for some reason using the 32-bit version
rather than the 64-bit.  Have tried configure --libdir=/usr/lib64 but
this doesn't appear to help.

Thanks.