Untested patch by Ty Sarna to make TELL64 work on older NetBSD systems.
According to Justin Pettit, this also works on OpenBSD, so I've added
that symbol as well.
diff --git a/Objects/fileobject.c b/Objects/fileobject.c
index a5d2fcc..88e6027 100644
--- a/Objects/fileobject.c
+++ b/Objects/fileobject.c
@@ -60,8 +60,12 @@
#endif
/* define the appropriate 64-bit capable tell() function */
-#ifdef MS_WIN64
-# define TELL64 _telli64
+#if defined(MS_WIN64)
+#define TELL64 _telli64
+#elif defined(__NetBSD__) || defined(__OpenBSD__)
+/* NOTE: this is only used on older
+ NetBSD prior to f*o() funcions */
+#define TELL64(fd) lseek((fd),0,SEEK_CUR)
#endif