There are posix_fadvise(2) but not POSIX_FADV_WILLNEED.
Patch from Ryo ONODERA.
#include <dirent.h>
#include <string.h>
#include <sys/types.h>
+#include <sys/stat.h>
#include <assert.h>
#if defined(HAVE_MMAP) || defined(__CYGWIN__)
# include <unistd.h>
{
#if defined(HAVE_MMAP) || defined(__CYGWIN__)
cache = mmap (0, fd_stat->st_size, PROT_READ, MAP_SHARED, fd, 0);
-#ifdef HAVE_POSIX_FADVISE
+#if defined(HAVE_POSIX_FADVISE) && defined(POSIX_FADV_WILLNEED)
posix_fadvise (fd, 0, fd_stat->st_size, POSIX_FADV_WILLNEED);
#endif
if (cache == MAP_FAILED)