diff --git a/configure.in b/configure.in
index 31ed85bd0..9146daa9a 100644
--- a/configure.in
+++ b/configure.in
@@ -241,6 +241,7 @@ AC_CHECK_SIZEOF(intptr_t)
 AC_CHECK_SIZEOF(uintptr_t)
 AC_CHECK_SIZEOF(ptrdiff_t)
 AC_CHECK_SIZEOF(size_t)
+AC_CHECK_SIZEOF(off_t)
 
 if test "$ac_cv_sizeof_long" -ne "$ac_cv_sizeof_void_p"; then
   AC_MSG_ERROR(sizes of long and void* are not identical)
@@ -593,10 +594,11 @@ AC_CHECK_HEADERS([assert.h crt_externs.h])
 #   fesetround - available in C99, but not older systems
 #   gmtime_r - recent posix, not on old systems
 #   readdir_r - recent posix, not on old systems
+#   stat64 - SuS largefile stuff, not on old systems
 #   sysconf - not on old systems
 #   _NSGetEnviron - Darwin specific
 #
-AC_CHECK_FUNCS([DINFINITY DQNAN ctermid fesetround ftime fchown getcwd geteuid gettimeofday gmtime_r lstat mkdir mknod nice readdir_r readlink rename rmdir select setegid seteuid setlocale setpgid setsid sigaction siginterrupt strftime strptime symlink sync sysconf tcgetpgrp tcsetpgrp times uname waitpid strdup system usleep atexit on_exit chown link fcntl ttyname getpwent getgrent kill getppid getpgrp fork setitimer getitimer strchr strcmp index bcopy memcpy rindex unsetenv _NSGetEnviron])
+AC_CHECK_FUNCS([DINFINITY DQNAN ctermid fesetround ftime fchown getcwd geteuid gettimeofday gmtime_r lstat mkdir mknod nice readdir_r readlink rename rmdir select setegid seteuid setlocale setpgid setsid sigaction siginterrupt stat64 strftime strptime symlink sync sysconf tcgetpgrp tcsetpgrp times uname waitpid strdup system usleep atexit on_exit chown link fcntl ttyname getpwent getgrent kill getppid getpgrp fork setitimer getitimer strchr strcmp index bcopy memcpy rindex unsetenv _NSGetEnviron])
 
 # Reasons for testing:
 #   netdb.h - not in mingw