AC_DEFUN([LX_DOCDIR_SUFFIX],
[
  AC_ARG_WITH([docsuffix],
AS_HELP_STRING([--with-docsuffix=DOCSUFFIX], [install the documentation under datadir/doc/DOCSUFFIX]),
              [], [with_docsuffix=no])

  AC_MSG_CHECKING([for the value of DOCSUFFIX])
  if test x"$with_docsuffix" != x"no"; then
    DOCSUFFIX="$with_docsuffix"
  else
    DOCSUFFIX="$PACKAGE_TARNAME-$PACKAGE_VERSION"
  fi
  AC_MSG_RESULT([$DOCSUFFIX])

  AC_SUBST(DOCSUFFIX)
])