--- IO-AIO/configure.ac	2010/12/01 04:43:13	1.2
+++ IO-AIO/configure.ac	2012/04/10 05:01:34	1.5
@@ -1,42 +1,12 @@
-AC_PREREQ(2.59)
 AC_INIT
 AC_CONFIG_SRCDIR([libeio/eio.h])
 AC_CONFIG_HEADERS([libeio/config.h])
 
+AC_PREREQ(2.60)
+AC_USE_SYSTEM_EXTENSIONS
+
 AC_PROG_CC
 
 m4_include([libeio/libeio.m4])
 
-dnl at least uclibc defines _POSIX_ADVISORY_INFO without *any* of the required
-dnl functionality actually being present. ugh.
-AC_CACHE_CHECK(for posix_madvise, ac_cv_posix_madvise, [AC_LINK_IFELSE([
-#include <sys/mman.h>
-int main (void)
-{
-   int res = posix_madvise ((void *)0, (size_t)0, POSIX_MADV_NORMAL);
-   int a = POSIX_MADV_SEQUENTIAL;
-   int b = POSIX_MADV_RANDOM;
-   int c = POSIX_MADV_WILLNEED;
-   int d = POSIX_MADV_DONTNEED;
-   return 0;
-}
-],ac_cv_posix_madvise=yes,ac_cv_posix_madvise=no)])
-test $ac_cv_posix_madvise = yes && AC_DEFINE(HAVE_POSIX_MADVISE, 1, posix_madvise(2) is available)
-
-AC_CACHE_CHECK(for posix_fadvise, ac_cv_posix_fadvise, [AC_LINK_IFELSE([
-#define _XOPEN_SOURCE 600
-#include <fcntl.h>
-int main (void)
-{
-   int res = posix_fadvise ((int)0, (off_t)0, (off_t)0, POSIX_FADV_NORMAL);
-   int a = POSIX_FADV_SEQUENTIAL;
-   int b = POSIX_FADV_NOREUSE;
-   int c = POSIX_FADV_RANDOM;
-   int d = POSIX_FADV_WILLNEED;
-   int e = POSIX_FADV_DONTNEED;
-   return 0;
-}
-],ac_cv_posix_fadvise=yes,ac_cv_posix_fadvise=no)])
-test $ac_cv_posix_fadvise = yes && AC_DEFINE(HAVE_POSIX_FADVISE, 1, posix_fadvise(2) is available)
-
 AC_OUTPUT