OpenBSD: patch-configure_ac,v 1.1 2021/01/10 16:10:37 sthen Exp $

- neuter test for doxygen, there's no way to forcibly disable
- handle readline under the name "ereadline"

Index: configure.ac
--- configure.ac.orig
+++ configure.ac
@@ -152,7 +152,7 @@ AC_CHECK_PROGS([DOXYGEN], [doxygen])
 if test -z "$DOXYGEN"; then
    AC_MSG_WARN([Doxygen not found - API documentation will not be generated])
 fi
-AM_CONDITIONAL([HAVE_DOXYGEN], [test -n "$DOXYGEN"])
+AM_CONDITIONAL([HAVE_DOXYGEN], [false])
 
 dnl  --------------------------------
 dnl | check for readline            |-----------------------------------------
@@ -175,6 +175,8 @@ if test "x$enable_textport" = "xyes" ; then
       only) USE_READLINE="yes"
             EXTRA_LIBREADLINE_DEPS=" "
             AC_MSG_RESULT([yes (using only readline)]) ;;
+      ereadline) USE_READLINE="ereadline"
+            AC_MSG_RESULT([yes (using ereadline)]) ;;
       *) USE_READLINE="yes"
          EXTRA_LIBREADLINE_DEPS="${withval}"
          AC_MSG_RESULT([yes (using extra libraries ${withval})]) ;;
@@ -184,7 +186,11 @@ if test "x$enable_textport" = "xyes" ; then
   dnl When checking readline, check using extra libraries first.
   dnl We want to protect against the link somehow succeeding, but only
   dnl failing at runtime, as seems to happen on some BSD systems.
-  if test "$USE_READLINE" = yes ; then
+  if test "$USE_READLINE" = ereadline ; then
+      EXTRA_LIBREADLINE_DEPS=" "
+      AC_DEFINE(HAVE_LIBREADLINE, [1], [Define if the text port uses readline])
+      READLINE_LIBS="-lereadline -lehistory"
+  else if test "$USE_READLINE" = yes ; then
    AC_CHECK_HEADERS(readline/readline.h readline/history.h)
    if test "x${ac_cv_header_readline_readline_h}" != "xyes" -o "x${ac_cv_header_readline_history_h}" != "xyes"; then
      AC_MSG_WARN([Could not find the headers for libreadline.])
@@ -238,6 +244,7 @@ if test "x$enable_textport" = "xyes" ; then
       AC_MSG_WARN([Could not find libreadline.])
     fi
    fi
+  fi
   fi
 fi