--- IO-AIO/configure	2008/05/11 01:03:33	1.2
+++ IO-AIO/configure	2008/05/12 00:31:43	1.4
@@ -2710,10 +2710,9 @@
 int main(void)
 {
    int fd = 0;
-   off64_t offset = 1;
    size_t count = 2;
    ssize_t res;
-   res = readahead (fd, offset, count);
+   res = readahead (fd, 0, count);
    return 0;
 }
 
@@ -2754,11 +2753,6 @@
 #define HAVE_READAHEAD 1
 _ACEOF
 
-test $ac_cv_readahead = yes &&
-cat >>confdefs.h <<\_ACEOF
-#define _GNU_SOURCE 1
-_ACEOF
-
 
 { echo "$as_me:$LINENO: checking for fdatasync" >&5
 echo $ECHO_N "checking for fdatasync... $ECHO_C" >&6; }