这个脚本为什么不能在gentoo上运行呢？

Verifying archive integrity...tail: 无法打开 ‘+6’ 来读取数据: 没有那个文件或目录
Error in check sums 3086482786 3031636474

#! /bin/sh
skip=179
# This script was generated using Makeself 1.5.5
CRCsum=3031636474
MD5=6b2176e5726414257b6eb3374c6ae53b
label="Return To Castle Wolfenstein"
script=./setup.sh
targetdir=wolf-setup
scriptargs="1.4"
keep=n
TMPROOT=${TMPDIR:=/tmp}
finish=true; xterm_loop=;
[ x"$1" = x-xwin ] && {
 finish="echo Press Return to close this window...; read junk"; xterm_loop=1; shift 1;
}
if [ x"$1" = "x-help" -o x"$1" = "x--help" ]; then
 cat << tac
 1) Getting help or info about $0 :
 $0 --help Print this message
 $0 --info Print embedded info : title, default target directory, embedded script ...
 $0 --lsm Print embedded lsm entry (or no LSM)
 $0 --list Print the list of files in the archive
 $0 --check Checks integrity of the archive
 
 2) Running $0 :
 $0 [options] [additional arguments to embedded script]
 with following options (in that order)
 --confirm Ask before running embedded script
 --keep Do not erase target directory after running embedded script
 --target NewDirectory Extract in NewDirectory
tac
 exit 0;
fi
if [ x"$1" = "x-lsm" -o x"$1" = "x--lsm" ]; then
 cat << EOF_LSM
no LSM
EOF_LSM
 exit 0;
fi
if [ "$1" = "--info" ]; then
        echo Identification: $label
        echo Target directory: $targetdir
        echo Uncompressed size: 18252 KB
        echo Compression: gzip
        echo Date of packaging: Tue Nov 5 15:01:42 CET 2002
        echo script run after extraction: $script $scriptargs
        [ x"$keep" = xy ] && echo "directory $targetdir is permanent" || echo "$targetdir will be removed after extraction"
        exit 0;
fi
if [ "$1" = "--list" ]; then
        echo Target directory: $targetdir
        tail +$skip $0 | gzip -cd | tar tvf -
        exit 0;
fi
if [ "$1" = "--check" ]; then
sum1=`tail +6 $0 | cksum | sed -e 's/ /Z/' -e 's/       /Z/' | cut -dZ -f1`
[ "$sum1" != "$CRCsum" ] && {
 echo Error in checksums $sum1 $CRCsum
 exit 2;
}
if [ $MD5 != "00000000000000000000000000000000" ]; then
# space separated list of directories
 [ x"$GUESS_MD5_PATH" = "x" ] && GUESS_MD5_PATH="/usr/local/ssl/bin /usr/local/bin /usr/bin"
 MD5_PATH=""
 for a in $GUESS_MD5_PATH; do
 #if which $a/md5 >/dev/null 2>&1 ; then
 if [ -x "$a/md5sum" ]; then
 MD5_PATH=$a;
 fi
 done
 if [ -x $MD5_PATH/md5sum ]; then
 md5sum=`tail +6 $0 | $MD5_PATH/md5sum | cut -b-32`;
 [ $md5sum != $MD5 ] && {
 echo Error in md5 sums $md5sum $MD5
 exit 2
 } || { echo check sums and md5 sums are ok; exit 0; }
 fi
 if [ ! -x $MD5_PATH/md5sum ]; then
 echo an embedded md5 sum of the archive exists but no md5 program was found in $GUESS_MD5_PATH
 echo if you have md5 on your system, you should try :
 echo env GUESS_MD5_PATH=\"FirstDirectory SecondDirectory ...\" $0 -check
 fi
else
 echo check sums are OK ; echo $0 does not contain embedded md5 sum ;
fi
        exit 0;
fi
[ x"$finish" = x ] && finish=true
parsing=yes
x11=y
while [ x"$parsing" != x ]; do
 case "$1" in
 --confirm) verbose=y; shift;;
 --keep) keep=y; shift;;
 --nox11) x11=n; shift;;
 --target) if [ x"$2" != x ]; then targetdir="$2"; keep=y; shift 2; fi;;
 *) parsing="";;
 esac
done
if [ "$x11" = "y" ]; then
 if ! tty -s; then # Do we have a terminal?
 if [ x"$DISPLAY" != x -a x"$xterm_loop" = x ]; then # No, but do we have X?
 if xset q > /dev/null 2>&1; then # Check for valid DISPLAY variable
 GUESS_XTERMS="xterm dtterm eterm Eterm rxvt kvt konsole aterm"
 for a in $GUESS_XTERMS; do
 if which $a >/dev/null 2>&1; then
 XTERM=$a
 break
 fi
 done
 chmod a+x $0 || echo Please add execution rights on $0
 if [ `echo "$0" | cut -c1` = / ]; then # Spawn a terminal!
 exec $XTERM -title "$label" -e "$0" -xwin "$@"
 else
 exec $XTERM -title "$label" -e "./$0" -xwin "$@"
 fi
 fi
 fi
 fi
fi
if [ "$keep" = y ]; then echo "Creating directory $targetdir"; tmpdir=$targetdir;
else tmpdir="$TMPROOT/selfgz$$"; fi
mkdir $tmpdir || {
 $echo 'Cannot create target directory' $tmpdir >&2
 $echo 'you should perhaps try option -target OtherDirectory' >&2
 eval $finish; exit 1;
}
location="`pwd`"
echo=echo; [ -x /usr/ucb/echo ] && echo=/usr/ucb/echo
if [ x$SETUP_NOCHECK != x1 ]; then
 $echo -n Verifying archive integrity...
 sum1=`tail +6 $0 | cksum | sed -e 's/ /Z/' -e 's/      /Z/' | cut -dZ -f1`
 [ $sum1 != $CRCsum ] && {
 $echo Error in check sums $sum1 $CRCsum
 eval $finish; exit 2;
 }
 echo OK
fi
if [ $MD5 != \"00000000000000000000000000000000\" ]; then
# space separated list of directories
 [ x"$GUESS_MD5_PATH" = "x" ] && GUESS_MD5_PATH="/usr/local/ssl/bin /usr/local/bin /usr/bin"
 MD5_PATH=""
 for a in $GUESS_MD5_PATH; do
 #if which $a/md5 >/dev/null 2>&1 ; then
 if [ -x "$a/md5sum" ]; then
 MD5_PATH=$a;
 fi
 done
 if [ -x $MD5_PATH/md5sum ]; then
 md5sum=`tail +6 $0 | $MD5_PATH/md5sum | cut -b-32`;
 [ $md5sum != $MD5 ] && {
 $echo Error in md5 sums $md5sum $MD5
 eval $finish; exit 2;
 }
 fi
fi
UnTAR() { tar xvf - || { echo Extraction failed. > /dev/tty; kill -15 $$; } ; }
$echo -n "Uncompressing $label"
cd $tmpdir ; res=3
[ "$keep" = y ] || trap 'echo Signal caught, cleaning up > /dev/tty; cd $TMPROOT; /bin/rm -rf $tmpdir; eval $finish; exit 15' 1 2 15
if (cd "$location"; tail +$skip $0; ) | gzip -cd | UnTAR | (while read a; do $echo -n .; done; echo; ); then
        chown -Rf `id -u`.`id -g` .
 res=0; if [ x"$script" != x ]; then
 if [ x"$verbose" = xy ]; then
 $echo "OK to execute: $script $scriptargs $* ? [Y/n] "
 read yn
 [ x"$yn" = x -o x"$yn" = xy -o x"$yn" = xY ] && { $script $scriptargs $*; res=$?; }
 else
 $script $scriptargs $*; res=$?
 fi
 [ $res != 0 ] && echo "The program returned an error code ($res)"
        fi
 [ "$keep" = y ] || { cd $TMPROOT; /bin/rm -rf $tmpdir; }
else
 echo "Cannot decompress $0"; eval $finish; exit 1
fi
eval $finish; exit $res
END_OF_STUB