AC_DEFUN([AG_GST_VALGRIND_CHECK],

[

  dnl valgrind inclusion

  AC_ARG_ENABLE(valgrind,

    AC_HELP_STRING([--disable-valgrind], [disable run-time valgrind detection]),

    [

      case "${enableval}" in

        yes) USE_VALGRIND="$USE_DEBUG" ;;

        no)  USE_VALGRIND=no ;;

        *) AC_MSG_ERROR(bad value ${enableval} for --enable-valgrind) ;;

      esac],

    [

      USE_VALGRIND="$USE_DEBUG"

    ]) dnl Default value

  VALGRIND_REQ="3.0"

  if test "x$USE_VALGRIND" = xyes; then

    PKG_CHECK_MODULES(VALGRIND, valgrind >= $VALGRIND_REQ,

      USE_VALGRIND="yes",

      [

        USE_VALGRIND="no"

        AC_MSG_RESULT([no])

      ])

  fi

  if test "x$USE_VALGRIND" = xyes; then

    AC_DEFINE(HAVE_VALGRIND, 1, [Define if valgrind should be used])

    AC_MSG_NOTICE(Using extra code paths for valgrind)

  fi

  AC_SUBST(VALGRIND_CFLAGS)

  AC_SUBST(VALGRIND_LIBS)

  AC_PATH_PROG(VALGRIND_PATH, valgrind, no)

  AM_CONDITIONAL(HAVE_VALGRIND, test ! "x$VALGRIND_PATH" = "xno")

])