AC_DEFUN([LX_ENABLE_DOC],

[

  AC_ARG_ENABLE([doc],

AS_HELP_STRING([--enable-doc@<:@=yes|no|full@:>@], [build the documentation (full enables internal documentation too) @<:@default=yes@:>@])

AS_HELP_STRING([--disable-doc], [do not build the documentation]),

         [], [enable_doc=yes])

  AC_MSG_CHECKING([whether to build the documention])

  case "$enable_doc" in

    yes)

      DOXYGEN_INTERNAL_DOCS=NO

      AC_MSG_RESULT([yes])

      ;;

    full)

      DOXYGEN_INTERNAL_DOCS=YES

      AC_MSG_RESULT([full])

      ;;

    no)

      DOXYGEN_INTERNAL_DOCS=NO

      AC_MSG_RESULT([no])

      ;;

    *)

      AC_MSG_ERROR([bad value $enable_doc for option --enable-doc])

      ;;

  esac

  AC_SUBST(DOXYGEN_INTERNAL_DOCS)

  AM_CONDITIONAL([WANT_DOC], [test x"$enable_doc" != x"no"])

])