[crazy bug] please help me

[jojelino]

i'm willing to make autoconf from git build but it sucks.

$ ./configure
checking build system type... i686-pc-cygwin
checking for a BSD-compatible install... /usr/bin/install -c
checking whether build environment is sane... yes
checking for a thread-safe mkdir -p... /usr/bin/mkdir -p
checking for gawk... gawk
checking whether make sets $(MAKE)... yes
checking for perl... /usr/bin/perl
checking whether /usr/bin/perl supports ithreads... yes
checking for tex... tex
checking whether autoconf is installed... yes
checking whether autoconf works... yes
checking whether autoconf is recent enough... yes
checking whether ln works... yes
checking for grep that handles long lines and -e... /usr/bin/grep
checking for egrep... /usr/bin/grep -E
checking for fgrep... /usr/bin/grep -F
checking whether /bin/sh has working 'set -e' with exit trap... yes
configure: creating ./config.status
./config.status: line 1: :t: command not found
./config.status: line 2: /@[a-zA-Z_][a-zA-Z_0-9]*@/!b: No such file or 
directory

./config.status: line 3: syntax error near unexpected token `;'
./config.status: line 3: `s|@configure_input@|$ac_sed_conf_input|;t t'

all package are sane except autoconf !!!!!!!!!
what the hell reason it complain?? i can't understand.
how about the pattern /@[a-zA-Z_][a-zA-Z_0-9]*@/!b? is something wrong???
i suspect status.m4 is moron enough to come out such bad attitude.
please give me your wisdom or i nuke them all