+dnl Very limited version of automake's enable-maintainer-mode
+
+AC_MSG_CHECKING([whether to enable maintainer-specific portions of Makefiles])
+ dnl maintainer-mode is disabled by default
+ AC_ARG_ENABLE(maintainer-mode,
+[ --enable-maintainer-mode
+ enable make rules and dependencies not useful
+ (and sometimes confusing) to the casual installer],
+ maintainer_mode=$enableval,
+ maintainer_mode=no)
+
+AC_MSG_RESULT($maintainer_mode)
+
+if test "$maintainer_mode" = "yes"; then
+ MAINT=''
+ NOTMAINT='#'
+else
+ MAINT='#'
+ NOTMAINT=''
+fi
+AC_SUBST(MAINT)dnl
+AC_SUBST(NOTMAINT)dnl
+
+# Do we have a single-tree copy of texinfo? Even if we do, we can't
+# rely on it - libiberty is built before texinfo.
+AC_CHECK_PROG(MAKEINFO, makeinfo, makeinfo, )
+if test "x$MAKEINFO" = "x"; then
+ MAKEINFO="@echo makeinfo missing; true"
+ BUILD_INFO=
+else
+ BUILD_INFO=info
+ case x"`$MAKEINFO --version | grep 'GNU texinfo'`" in
+ x*\ [[1-3]].* )
+ MAKEINFO="@echo $MAKEINFO is too old, 4.0 or newer required; true"
+ BUILD_INFO=
+ AC_MSG_WARN([
+*** Makeinfo is too old. Info documentation will not be built.])
+ ;;
+ esac
+fi
+AC_SUBST(MAKEINFO)
+AC_SUBST(BUILD_INFO)
+
+AC_CHECK_PROG(PERL, perl, perl, )
+if test x"$PERL" = x""; then
+ HAVE_PERL='#'
+else
+ HAVE_PERL=''
+fi
+AC_SUBST(HAVE_PERL)
+