diff --git a/PC/config.h b/PC/config.h
index 0247cef37e0..0d18d4bafc0 100644
--- a/PC/config.h
+++ b/PC/config.h
@@ -330,13 +330,13 @@ typedef int pid_t;
 #define HAVE_FTIME
 
 /* Define if you have getpeername.  */
-/* #undef HAVE_GETPEERNAME */
+#define HAVE_GETPEERNAME
 
 /* Define if you have getpgrp.  */
 /* #undef HAVE_GETPGRP */
 
 /* Define if you have getpid.  */
-/* #undef HAVE_GETPID */
+#define HAVE_GETPID
 
 /* Define if you have gettimeofday.  */
 /* #undef HAVE_GETTIMEOFDAY */
@@ -365,6 +365,9 @@ typedef int pid_t;
 /* Define if you have setsid.  */
 /* #undef HAVE_SETSID */
 
+/* Define if you have setvbuf.  */
+#define HAVE_SETVBUF
+
 /* Define if you have siginterrupt.  */
 /* #undef HAVE_SIGINTERRUPT */