emil port build fails with yydebug error ...

[Marc G. Fournier]

bison -y -l -v getoption.y
flex  -i getoption.l
gcc -c -DHAVE_CONFIG_H -DSMTP -DNAMED_BIND -DUSE_MX -DDEBUG -DMAINCF=\"/usr/local/lib/emil.cf\" -DCHARFILE=\"/usr/local/lib/charsets.cpl\" -DSENDMAILPATH=\"\" -DSENDMAILPROG=\"\" -DSENDERFLAG=\"\" -DLOG_FACILITY=LOG_MAIL -DSMTPHOSTNAME=\"host.domain\" -DEMIL_VERSION=\"2.1.0-beta9\" -DEMILPATH=\"/usr/local/bin/emil\" -O -mpentium -pipe -o getoption.o y.tab.c
gcc -o emil  7bit.o appledouble.o applefile.o applesingle.o base64.o binary.o binhex.o  buffer.o convert.o filenames.o forks.o format.o hbase64.o header.o  hqp.o hqxbin.o load.o logger.o mailtool.o main.o message.o mime.o  mimeparse.o ns.o out.o qp.o rfc1522.o rfc822.o rfc822parse.o  smtp.o structure.o sunparse.o uuencode.o  s_attr.o d_attr.o a_attr.o charset.o getoption.o ./charset/dfopen.o -lm
getoption.o: In function `getoption':
getoption.o(.text+0x1b21): undefined reference to `yydebug'
getoption.o: In function `getmember':
getoption.o(.text+0x1c98): undefined reference to `yydebug'
getoption.o: In function `get_mailer':
getoption.o(.text+0x2090): undefined reference to `yydebug'
*** Error code 1

Stop in /home/ports/usr/ports/mail/emil/work/emil-2.1.0-beta9.