jhalfs can't work with sed-4.9

Error log as below:
Creating Makefile... START
        Processing... <Chapter 4>
sed: -e expression #1, char 17: Invalid range end

<jhalfs> exit

I have located it happend at jhalfs/LFS/master.sh line 69.

 67     # Grab the name of the target
 68     # This is only used to check the name in "opt_override" or
"BLACKLIST"
 69     name=`echo ${this_script} | sed -e 's@[0-9]\{3,4\}-@@' \
 70                                     -e 's@-pass[0-9]\{1\}@@' \
 71                                     -e 's@-libstdc++@@' \
 72                                     -e 's,'$N',,' \
 73                                     -e 's@-32@@'`
 74

But I know nothing about sed :-)

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