if test x$have_libpng = xfalse ; then

  succeeded=no

  if test -z "$PKG_CONFIG"; then

    # Extract the first word of "pkg-config", so it can be a program name with args.

set dummy pkg-config; ac_word=$2

echo "$as_me:$LINENO: checking for $ac_word" >&5

echo $ECHO_N "checking for $ac_word... $ECHO_C" >&6

if test "${ac_cv_path_PKG_CONFIG+set}" = set; then

  echo $ECHO_N "(cached) $ECHO_C" >&6

else

  case $PKG_CONFIG in

  [\\/]* | ?:[\\/]*)

  ac_cv_path_PKG_CONFIG="$PKG_CONFIG" # Let the user override the test with a path.

  ;;

  *)

  as_save_IFS=$IFS; IFS=$PATH_SEPARATOR

for as_dir in $PATH

do

  IFS=$as_save_IFS

  test -z "$as_dir" && as_dir=.

  for ac_exec_ext in '' $ac_executable_extensions; do

  if $as_executable_p "$as_dir/$ac_word$ac_exec_ext"; then

    ac_cv_path_PKG_CONFIG="$as_dir/$ac_word$ac_exec_ext"

    echo "$as_me:$LINENO: found $as_dir/$ac_word$ac_exec_ext" >&5

    break 2

  fi

done

done

  test -z "$ac_cv_path_PKG_CONFIG" && ac_cv_path_PKG_CONFIG="no"

  ;;

esac

fi

PKG_CONFIG=$ac_cv_path_PKG_CONFIG

if test -n "$PKG_CONFIG"; then

  echo "$as_me:$LINENO: result: $PKG_CONFIG" >&5

echo "${ECHO_T}$PKG_CONFIG" >&6

else

  echo "$as_me:$LINENO: result: no" >&5

echo "${ECHO_T}no" >&6

fi

  fi

  if test "$PKG_CONFIG" = "no" ; then

     echo "*** The pkg-config script could not be found. Make sure it is"

     echo "*** in your path, or set the PKG_CONFIG environment variable"

     echo "*** to the full path to pkg-config."

     echo "*** Or see http://www.freedesktop.org/software/pkgconfig to get pkg-config."

  else

     PKG_CONFIG_MIN_VERSION=0.9.0

     if $PKG_CONFIG --atleast-pkgconfig-version $PKG_CONFIG_MIN_VERSION; then

        echo "$as_me:$LINENO: checking for libpng12" >&5

echo $ECHO_N "checking for libpng12... $ECHO_C" >&6

        if $PKG_CONFIG --exists "libpng12" ; then

            echo "$as_me:$LINENO: result: yes" >&5

echo "${ECHO_T}yes" >&6

            succeeded=yes

            echo "$as_me:$LINENO: checking LIBPNG_CFLAGS" >&5

echo $ECHO_N "checking LIBPNG_CFLAGS... $ECHO_C" >&6

            LIBPNG_CFLAGS=`$PKG_CONFIG --cflags "libpng12"`

            echo "$as_me:$LINENO: result: $LIBPNG_CFLAGS" >&5

echo "${ECHO_T}$LIBPNG_CFLAGS" >&6

            echo "$as_me:$LINENO: checking LIBPNG_LIBS" >&5

echo $ECHO_N "checking LIBPNG_LIBS... $ECHO_C" >&6

            LIBPNG_LIBS=`$PKG_CONFIG --libs "libpng12"`

            echo "$as_me:$LINENO: result: $LIBPNG_LIBS" >&5

echo "${ECHO_T}$LIBPNG_LIBS" >&6

        else

            LIBPNG_CFLAGS=""

            LIBPNG_LIBS=""

            ## If we have a custom action on failure, don't print errors, but

            ## do set a variable so people can do so.

            LIBPNG_PKG_ERRORS=`$PKG_CONFIG --errors-to-stdout --print-errors "libpng12"`

        fi

     else

        echo "*** Your version of pkg-config is too old. You need version $PKG_CONFIG_MIN_VERSION or newer."

        echo "*** See http://www.freedesktop.org/software/pkgconfig"

     fi

  fi

  if test $succeeded = yes; then

     have_libpng=true

  else

     have_libpng=false

  fi

  fi