$NetBSD$

Require posix_fadvise instead of readahead for greater portability.

--- configure.orig	2009-04-15 21:49:29.000000000 +0000
+++ configure
@@ -5735,7 +5735,7 @@ fi
 
 # Checks for library functions and headers.
 
-for ac_func in readahead
+for ac_func in posix_fadvise
 do
 as_ac_var=`$as_echo "ac_cv_func_$ac_func" | $as_tr_sh`
 { $as_echo "$as_me:$LINENO: checking for $ac_func" >&5
@@ -5833,7 +5833,7 @@ as_val=`eval 'as_val=${'$as_ac_var'}
 _ACEOF
 
 else
-  echo "*** readahead(2) system call required but not found.";
+  echo "*** posix_fadvise(2) system call required but not found.";
 			   echo "*** get yourself a recent Linux and glibc";
 			   echo "*** Exiting";
 			   exit 1;