Asterisk Compilation Issue

[rawat]

Hello Folks,

During the compilation of asterisk (version 11), I am getting below error.

Flex/Bison are installed (/usr/bin ).

checking for strlcat… no
updating cache ./config.cache
creating ./config.status
creating Makefile
creating makelist
creating config.h
[LD] abstract_jb.o acl.o adsi.o alaw.o aoc.o app.o ast_expr2.o ast_expr2f.o asterisk.o astfd.o astmm.o astobj2.o audiohook.o autochan.o autoservice.o bridging.o callerid.o ccss.o cdr.o cel.o channel.o channel_internal_api.o chanvars.o cli.o config.o config_options.o data.o datastore.o db.o devicestate.o dial.o dns.o dnsmgr.o dsp.o enum.o event.o features.o file.o fixedjitterbuf.o format.o format_cap.o format_pref.o frame.o framehook.o fskmodem.o global_datastores.o hashtab.o heap.o http.o image.o indications.o io.o jitterbuf.o loader.o lock.o logger.o manager.o md5.o message.o named_acl.o netsock.o netsock2.o pbx.o plc.o poll.o presencestate.o privacy.o rtp_engine.o say.o sched.o security_events.o sha1.o sip_api.o slinfactory.o srv.o stdtime/localtime.o strcompat.o strings.o stun.o syslog.o taskprocessor.o tcptls.o tdd.o term.o test.o threadstorage.o timing.o translate.o udptl.o ulaw.o utils.o version.o xml.o xmldoc.o editline/libedit.a → asterisk
ast_expr2.o: In function yyparse': /asterisk-11/main/y.tab.c:2416: undefined reference to yyerror’
/asterisk-11/main/y.tab.c:1983: undefined reference to yylex' /asterisk-11/main/y.tab.c:2416: undefined reference to yyerror’
/asterisk-11/main/y.tab.c:2416: undefined reference to yyerror' /asterisk-11/main/y.tab.c:2537: undefined reference to yyerror’
ast_expr2f.o: In function ast_expr': /asterisk-11/main/ast_expr2.fl:267: undefined reference to ast_yyparse’
ast_expr2f.o: In function ast_str_expr': /asterisk-11/main/ast_expr2.fl:306: undefined reference to ast_yyparse’
collect2: ld returned 1 exit status
make[1]: *** [asterisk] Error 1
make: *** [main] Error 2

Please guide me in solving this issue.

Thanks,
Rawat