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diff -Naur pilot-link-0.12.2.orig/m4/vl_lib_readline.m4 pilot-link-0.12.2/m4/vl_lib_readline.m4
--- pilot-link-0.12.2.orig/m4/vl_lib_readline.m4	2005-06-03 20:39:24.000000000 +0200
+++ pilot-link-0.12.2/m4/vl_lib_readline.m4	2007-08-25 15:23:58.000000000 +0200
@@ -89,23 +89,23 @@
       fi
       LIBS="$ORIG_LIBS"
     ])
-  fi
 
-  if test "$vl_cv_lib_readline" != "no"; then
-    msg_readline="yes"
-    RL_LIBS="$vl_cv_lib_readline"
-    AC_DEFINE(HAVE_LIBREADLINE, 1,
-              [Define if you have a readline compatible library])
-    AC_CHECK_HEADERS(readline.h readline/readline.h)
-    AC_CACHE_CHECK([whether readline supports history],
-                   vl_cv_lib_readline_history, [
-      vl_cv_lib_readline_history="no"
-      AC_TRY_LINK_FUNC(add_history, vl_cv_lib_readline_history="yes")
-    ])
-    if test "$vl_cv_lib_readline_history" = "yes"; then
-      AC_DEFINE(HAVE_READLINE_HISTORY, 1,
-                [Define if your readline library has \`add_history'])
-      AC_CHECK_HEADERS(history.h readline/history.h)
+    if test "$vl_cv_lib_readline" != "no"; then
+      msg_readline="yes"
+      RL_LIBS="$vl_cv_lib_readline"
+      AC_DEFINE(HAVE_LIBREADLINE, 1,
+                [Define if you have a readline compatible library])
+      AC_CHECK_HEADERS(readline.h readline/readline.h)
+      AC_CACHE_CHECK([whether readline supports history],
+                     vl_cv_lib_readline_history, [
+        vl_cv_lib_readline_history="no"
+        AC_TRY_LINK_FUNC(add_history, vl_cv_lib_readline_history="yes")
+      ])
+      if test "$vl_cv_lib_readline_history" = "yes"; then
+        AC_DEFINE(HAVE_READLINE_HISTORY, 1,
+                  [Define if your readline library has \`add_history'])
+        AC_CHECK_HEADERS(history.h readline/history.h)
+      fi
     fi
   fi
   AC_SUBST(RL_LIBS)