[xml] Error building libxml2

[Anne Ramey <anner blast com>]

I run into this error when trying to do the make after ./configure 
--with-zlib=/data/src/apache_src/php-4.1.2/ext/zlib --enable-ipv6=no

(cd .libs && rm -f libxml2.la && ln -s ../libxml2.la libxml2.la)
source='xmllint.c' object='xmllint.o' libtool=no \
depfile='.deps/xmllint.Po' tmpdepfile='.deps/xmllint.TPo' \
depmode=gcc /bin/sh ./depcomp \
gcc -DHAVE_CONFIG_H -I. -I. -I. -I./include -I./include  -D_REENTRANT   
   -g -O2 -Wall -c `test -f 'xmllint.c' || echo './'`xmllint.c
/bin/sh ./libtool --mode=link gcc  -g -O2 -Wall   -o xmllint  xmllint.o 
./libxml2.la -lpthread   -lm
gcc -g -O2 -Wall -o .libs/xmllint xmllint.o  ./.libs/libxml2.so 
-lpthread -lm -Wl,--rpath -Wl,/usr/local/lib
./.libs/libxml2.so: undefined reference to `deflate'
./.libs/libxml2.so: undefined reference to `gzopen'
./.libs/libxml2.so: undefined reference to `crc32'
./.libs/libxml2.so: undefined reference to `gzread'
./.libs/libxml2.so: undefined reference to `deflateInit2_'
./.libs/libxml2.so: undefined reference to `gzdopen'
./.libs/libxml2.so: undefined reference to `gzclose'
./.libs/libxml2.so: undefined reference to `atexit'
./.libs/libxml2.so: undefined reference to `gzwrite'
./.libs/libxml2.so: undefined reference to `gzrewind'
./.libs/libxml2.so: undefined reference to `deflateEnd'
collect2: ld returned 1 exit status
make[2]: *** [xmllint] Error 1
make[2]: Leaving directory `/data/test/XML/libxml2-2.6.4'
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory `/data/test/XML/libxml2-2.6.4'
make: *** [all] Error 2


I don't have any files called deflate, gzopen, etc on my 
system...should I?  Am I missing re-reqs?

Anne