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#     tardir=directory && $(am__tar) > result.tar

#

# Substitute a variable $(am__untar) that extract such

# a tarball read from stdin.

#     $(am__untar) < result.tar

AC_DEFUN([_AM_PROG_TAR],

[# Always define AMTAR for backward compatibility.  Yes, it's still used

# in the wild :-(  We should find a proper way to deprecate it ...

AC_SUBST([AMTAR], ['$${TAR-tar}'])

m4_if([$1], [v7],

     [am__tar='$${TAR-tar} chof - "$$tardir"' am__untar='$${TAR-tar} xf -'],

     [m4_case([$1], [ustar],, [pax],,

              [m4_fatal([Unknown tar format])])

AC_MSG_CHECKING([how to create a $1 tar archive])

# Loop over all known methods to create a tar archive until one works.

_am_tools='gnutar m4_if([$1], [ustar], [plaintar]) pax cpio none'

_am_tools=${am_cv_prog_tar_$1-$_am_tools}

# Do not fold the above two line into one, because Tru64 sh and

# Solaris sh will not grok spaces in the rhs of '-'.

for _am_tool in $_am_tools

do

  case $_am_tool in

  gnutar)

    for _am_tar in tar gnutar gtar;

    do

      AM_RUN_LOG([$_am_tar --version]) && break

    done

    am__tar="$_am_tar --format=m4_if([$1], [pax], [posix], [$1]) -chf - "'"$$tardir"'

    am__tar_="$_am_tar --format=m4_if([$1], [pax], [posix], [$1]) -chf - "'"$tardir"'

    am__untar="$_am_tar -xf -"

    ;;

  plaintar)

    # Must skip GNU tar: if it does not support --format= it doesn't create

    # ustar tarball either.

    (tar --version) >/dev/null 2>&1 && continue

    am__tar='tar chf - "$$tardir"'

    am__tar_='tar chf - "$tardir"'

    am__untar='tar xf -'

    ;;

  pax)

    am__tar='pax -L -x $1 -w "$$tardir"'

    am__tar_='pax -L -x $1 -w "$tardir"'

    am__untar='pax -r'

    ;;

  cpio)

    am__tar='find "$$tardir" -print | cpio -o -H $1 -L'

    am__tar_='find "$tardir" -print | cpio -o -H $1 -L'

    am__untar='cpio -i -H $1 -d'

    ;;

  none)

    am__tar=false

    am__tar_=false

    am__untar=false

    ;;

  esac

  # If the value was cached, stop now.  We just wanted to have am__tar

  # and am__untar set.

  test -n "${am_cv_prog_tar_$1}" && break

  # tar/untar a dummy directory, and stop if the command works

  rm -rf conftest.dir

  mkdir conftest.dir

  echo GrepMe > conftest.dir/file

  AM_RUN_LOG([tardir=conftest.dir && eval $am__tar_ >conftest.tar])

  rm -rf conftest.dir

  if test -s conftest.tar; then

    AM_RUN_LOG([$am__untar 

    grep GrepMe conftest.dir/file >/dev/null 2>&1 && break

  fi

done

rm -rf conftest.dir

AC_CACHE_VAL([am_cv_prog_tar_$1], [am_cv_prog_tar_$1=$_am_tool])

AC_MSG_RESULT([$am_cv_prog_tar_$1])])

AC_SUBST([am__tar])

AC_SUBST([am__untar])

]) # _AM_PROG_TAR