i currently use squid 2.5STABLE 12 on redhat enterprise server that working find. When i try to compile squid 2.6STABLE4 i have this errors : gcc -D_FILE_OFFSET_BITS=64 -Wall -g -O2 -D_REENTRANT -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_poll.o debug.o disk.o dns_internal.o errorpage.o event.o errormap.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 locrewrite.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_monitor.o peer_select.o peer_sourcehash.o peer_userhash.o redirect.o referer.o refresh.o send-announce.o snmp_core.o snmp_agent.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 wccp2.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 fs/libaufs.a auth/libbasic.a -lcrypt -lregex -L../snmplib -lsnmp -lmiscutil -lpthread -lm -lbsd -lnsl fs/libaufs.a(aiops.o)(.text+0x3ba): In function `squidaio_init': aufs/aiops.c:334: undefined reference to `n_coss_dirs' collect2: ld returned 1 exit status make[3]: *** [squid] Error 1 make[3]: Leaving directory `/opt/sources/squid-2.6.STABLE4/src' make[2]: *** [all-recursive] Error 1 make[2]: Leaving directory `/opt/sources/squid-2.6.STABLE4/src' make[1]: *** [all] Error 2 make[1]: Leaving directory `/opt/sources/squid-2.6.STABLE4/src' make: *** [all-recursive] Error 1 What's happened ? Regards