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See the# GNU General Public License for more details.# You should have received a copy of the GNU General Public License# along with this program; if not, write to the Free Software# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA# 02111-1307, USA.# serial 1# _AM_PROG_TAR(FORMAT)# --------------------# Check how to create a tarball in format FORMAT.# FORMAT should be one of `v7', `ustar', or `pax'.## Substitute a variable $(am__tar) that is a command# writing to stdout a FORMAT-tarball containing the directory# $tardir.#     tardir=directory && $(am__tar) > result.tar## Substitute a variable $(am__untar) that extract such# a tarball read from stdin.#     $(am__untar) < result.tarAC_DEFUN([_AM_PROG_TAR],[# Always define AMTAR for backward compatibility.AM_MISSING_PROG([AMTAR], [tar])m4_if([$1], [v7],     [am__tar='${AMTAR} chof - "$$tardir"'; am__untar='${AMTAR} xf -'],     [m4_case([$1], [ustar],, [pax],,              [m4_fatal([Unknown tar format])])AC_MSG_CHECKING([how to create a $1 tar archive])# Loop over all known methods to create a tar archive until one works._am_tools='gnutar m4_if([$1], [ustar], [plaintar]) pax cpio none'_am_tools=${am_cv_prog_tar_$1-$_am_tools}# Do not fold the above two line into one, because Tru64 sh and# Solaris sh will not grok spaces in the rhs of `-'.for _am_tool in $_am_toolsdo  case $_am_tool in  gnutar)    for _am_tar in tar gnutar gtar;    do      AM_RUN_LOG([$_am_tar --version]) && break    done    am__tar="$_am_tar --format=m4_if([$1], [pax], [posix], [$1]) -chf - "'"$$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.    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