I want to make squid support gzip,but I have a problem when compiling: source='string_arrays.c' object='string_arrays.o' libtool=no \ depfile='.deps/string_arrays.Po' tmpdepfile='.deps/string_arrays.TPo' \ depmode=gcc3 /bin/sh ../cfgaux/depcomp \ gcc -DHAVE_CONFIG_H -DDEFAULT_CONFIG_FILE=\"/usr/local/squid/etc/squid.conf\" -I. -I. -I../include -I. -I. -I../include -I../include -g -O2 -Wall -c `test -f string_arrays.c || echo './'`string_arrays.c gcc -g -O2 -Wall -g -o squid access_log.o acl.o asn.o authenticate.o cache_cf.o CacheDigest.o cache_manager.o carp.o cbdata.o client_db.o client_side.o comm.o comm_select.o debug.o disk.o dns_internal.o errorpage.o ETag.o event.o external_acl.o fd.o filemap.o forward.o fqdncache.o ftp.o gopher.o helper.o http.o HttpStatusLine.o HttpHdrCc.o HttpHdrRange.o HttpHdrContRange.o HttpHeader.o HttpHeaderTools.o HttpBody.o HttpMsg.o HttpReply.o HttpRequest.o icmp.o icp_v2.o icp_v3.o ident.o internal.o ipc.o ipcache.o logfile.o main.o mem.o MemPool.o MemBuf.o mime.o multicast.o neighbors.o net_db.o Packer.o pconn.o peer_digest.o peer_select.o redirect.o referer.o refresh.o send-announce.o ssl.o stat.o StatHist.o String.o stmem.o store.o store_io.o store_client.o store_digest.o store_dir.o store_key_md5.o store_log.o store_rebuild.o store_swapin.o store_swapmeta.o store_swapout.o tools.o unlinkd.o url.o urn.o useragent.o wais.o wccp.o whois.o repl_modules.o auth_modules.o store_modules.o globals.o string_arrays.o -L../lib repl/liblru.a fs/libufs.a auth/libbasic.a -lcrypt -lmiscutil -lm -lresolv -lbsd -lnsl client_side.o(.text+0xf65): In function `gzip_data': /home/lq/squid-2.5.S12/src/client_side.c:2053: undefined reference to `deflate' client_side.o(.text+0xf9c):/home/lq/squid-2.5.S12/src/client_side.c:2059: undefined reference to `crc32' client_side.o(.text+0x54ba): In function `clientSendMoreData': /home/lq/squid-2.5.S12/src/client_side.c:2082: undefined reference to `deflate' client_side.o(.text+0x68f7):/home/lq/squid-2.5.S12/src/client_side.c:1539: undefined reference to `deflateInit2_' client_side.o(.text+0x6905):/home/lq/squid-2.5.S12/src/client_side.c:1541: undefined reference to `crc32' collect2: ld returned 1 exit status make[3]: *** [squid] Error 1 make[3]: Leaving directory `/home/lq/squid-2.5.S12/src' make[2]: *** [all-recursive] Error 1 make[2]: Leaving directory `/home/lq/squid-2.5.S12/src' make[1]: *** [all] Error 2 make[1]: Leaving directory `/home/lq/squid-2.5.S12/src' make: *** [all-recursive] Error 1