--- 64bit/osdef.h.in.ORIG	2017-11-15 01:50:38 -0600
+++ 64bit/osdef.h.in	2017-11-15 01:54:34 -0600
@@ -128,7 +128,11 @@
 extern int   rename __P((char *, char *));
 
 extern int   gethostname __P((char *, int));
+#ifdef _AIX
+extern off64_t lseek64(int, off64_t, int);
+#else
 extern int   lseek __P((int, int, int));
+#endif
 extern void  exit __P((int));
 extern char *getwd __P((char *));
 extern char *getenv __P((char *));
@@ -193,8 +197,13 @@
 #endif
 
 struct stat;
+#ifdef _AIX
+extern int stat64(const char *__restrict__, struct stat64 *__restrict__);
+extern int lstat64(const char *__restrict__, struct stat64 *__restrict__);
+#else
 extern int stat __P((char *, struct stat *));
 extern int lstat __P((char *, struct stat *));
+#endif
 extern int fstat __P((int, struct stat *));
 extern int fchmod __P((int, int));
 extern int fchown __P((int, int, int));