# Checks for library functions.
AC_FUNC_VPRINTF
AC_FUNC_MMAP
-AC_CHECK_FUNCS([geteuid getuid link memmove memset mkstemp strchr strrchr strtol getopt getopt_long sysconf ftruncate chsize rand random lrand48 random_r rand_r regcomp regerror regexec regfree posix_fadvise fstatvfs fstatfs])
+AC_CHECK_FUNCS([geteuid getuid link memmove memset mkstemp strchr strrchr strtol getopt getopt_long sysconf ftruncate chsize rand random lrand48 random_r rand_r regcomp regerror regexec regfree fstatvfs fstatfs])
+
+dnl AC_CHECK_FUNCS doesn't check for header files.
+dnl posix_fadvise() may be not available in older libc.
+AC_MSG_CHECKING([for posix_fadvise])
+AC_LINK_IFELSE([AC_LANG_SOURCE([[
+ #include <fcntl.h>
+ int main(void) {
+ return posix_fadvise(0, 0, 0, 0);
+ }
+ ]])],[
+ AC_MSG_RESULT([yes])
+ AC_DEFINE([HAVE_POSIX_FADVISE], [1], [Define to 1 if you have the `posix_fadvise' function.])
+ ],[AC_MSG_RESULT([no])])
#
if test "x$ac_cv_func_fstatvfs" = "xyes"; then