build: Don't link with -lreadline if readline was not found.

Currently, if libreadline is not installed, linking fails with

	ld: cannot find -lreadline

This patch makes the build succeed by linking para_client, para_audioc
and para_play without readline support in this case.

diff --git a/configure.ac b/configure.ac
index b456b53d148bfdfc81096e28376244e9ca979c1e..75194ffc3ed785713406f592890ec6ea05694332 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -732,15 +732,17 @@ AC_CHECK_HEADERS([readline/readline.h], [
 ])
 
 if test "$have_readline" = "yes"; then
-       readline_ldflags="$readline_libs -lreadline"
-       AC_SEARCH_LIBS([rl_free_keymap], [readline], [], [have_readline="no"])
+       readline_ldflags="$readline_libs"
+       AC_SEARCH_LIBS([rl_free_keymap], [readline], [
+               readline_ldflags="$readline_ldflags -lreadline"
+       ], [have_readline="no"])
        if test "$have_readline" = "no"; then # try with -lcurses
                 # clear cache
                AC_MSG_NOTICE([trying again with -lcurses])
                 unset ac_cv_search_rl_free_keymap 2> /dev/null
                AC_SEARCH_LIBS([rl_free_keymap], [readline], [
                        have_readline=yes
-                       readline_ldflags="$readline_ldflags -lcurses"
+                       readline_ldflags="$readline_ldflags -lreadline -lcurses"
                ], [], [-lcurses])
        fi
        if test "$have_readline" = "no"; then # try with -ltermcap
@@ -749,7 +751,7 @@ if test "$have_readline" = "yes"; then
                 unset ac_cv_search_rl_free_keymap 2> /dev/null
                AC_SEARCH_LIBS([rl_free_keymap], [readline], [
                        have_readline=yes
-                       readline_ldflags="$readline_ldflags -ltermcap"
+                       readline_ldflags="$readline_ldflags -lreadline -ltermcap"
                ], [], [-ltermcap])
        fi
 fi