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AC_DEFUN([DOVECOT_GLIBC], [
  dnl * Old glibcs have broken posix_fallocate(). Make sure not to use it.
  dnl * It may also be broken in AIX.
  AC_CACHE_CHECK([whether posix_fallocate() works],i_cv_posix_fallocate_works,[
    AC_RUN_IFELSE([AC_LANG_PROGRAM([[
      #define _XOPEN_SOURCE 600
      #include <stdio.h>
      #include <stdlib.h>
      #include <fcntl.h>
      #include <unistd.h>
      #if defined(__GLIBC__) && (__GLIBC__ < 2 || __GLIBC_MINOR__ < 7)
        possibly broken posix_fallocate
      #endif
      ]], [[
        int fd = creat("conftest.temp", 0600);
        int ret;
        if (fd == -1) {
          perror("creat()");
          return 2;
        }
        ret = posix_fallocate(fd, 1024, 1024) < 0 ? 1 : 0;
        unlink("conftest.temp");
        return ret;
    ]])],[
      i_cv_posix_fallocate_works=yes
    ], [
      i_cv_posix_fallocate_works=no
    ],[])
  ])
  AS_IF([test $i_cv_posix_fallocate_works = yes], [
    AC_DEFINE(HAVE_POSIX_FALLOCATE,, [Define if you have a working posix_fallocate()])
  ])
])