diff -Naurd mpfr-4.0.1-a/PATCHES mpfr-4.0.1-b/PATCHES
--- mpfr-4.0.1-a/PATCHES	2018-04-27 12:54:17.862594948 +0000
+++ mpfr-4.0.1-b/PATCHES	2018-04-27 12:54:17.894594642 +0000
@@ -0,0 +1 @@
+io-null-stream
diff -Naurd mpfr-4.0.1-a/VERSION mpfr-4.0.1-b/VERSION
--- mpfr-4.0.1-a/VERSION	2018-04-27 12:52:13.911782747 +0000
+++ mpfr-4.0.1-b/VERSION	2018-04-27 12:54:17.894594642 +0000
@@ -1 +1 @@
-4.0.1-p5
+4.0.1-p6
diff -Naurd mpfr-4.0.1-a/src/inp_str.c mpfr-4.0.1-b/src/inp_str.c
--- mpfr-4.0.1-a/src/inp_str.c	2018-01-09 12:30:58.000000000 +0000
+++ mpfr-4.0.1-b/src/inp_str.c	2018-04-27 12:54:17.882594757 +0000
@@ -37,9 +37,6 @@
   int retval;
   size_t nread;
 
-  if (stream == NULL)
-    stream = stdin;
-
   alloc_size = 100;
   str = (unsigned char *) mpfr_allocate_func (alloc_size);
   str_size = 0;
diff -Naurd mpfr-4.0.1-a/src/mpfr.h mpfr-4.0.1-b/src/mpfr.h
--- mpfr-4.0.1-a/src/mpfr.h	2018-04-27 12:52:13.907782785 +0000
+++ mpfr-4.0.1-b/src/mpfr.h	2018-04-27 12:54:17.894594642 +0000
@@ -27,7 +27,7 @@
 #define MPFR_VERSION_MAJOR 4
 #define MPFR_VERSION_MINOR 0
 #define MPFR_VERSION_PATCHLEVEL 1
-#define MPFR_VERSION_STRING "4.0.1-p5"
+#define MPFR_VERSION_STRING "4.0.1-p6"
 
 /* User macros:
    MPFR_USE_FILE:        Define it to make MPFR define functions dealing
diff -Naurd mpfr-4.0.1-a/src/out_str.c mpfr-4.0.1-b/src/out_str.c
--- mpfr-4.0.1-a/src/out_str.c	2018-01-09 12:30:58.000000000 +0000
+++ mpfr-4.0.1-b/src/out_str.c	2018-04-27 12:54:17.882594757 +0000
@@ -43,10 +43,6 @@
 
   MPFR_ASSERTN (base >= 2 && base <= 62);
 
-  /* when stream=NULL, output to stdout */
-  if (stream == NULL)
-    stream = stdout;
-
   if (MPFR_UNLIKELY (MPFR_IS_SINGULAR (op)))
     {
       if (MPFR_IS_NAN (op))
diff -Naurd mpfr-4.0.1-a/src/version.c mpfr-4.0.1-b/src/version.c
--- mpfr-4.0.1-a/src/version.c	2018-04-27 12:52:13.911782747 +0000
+++ mpfr-4.0.1-b/src/version.c	2018-04-27 12:54:17.894594642 +0000
@@ -25,5 +25,5 @@
 const char *
 mpfr_get_version (void)
 {
-  return "4.0.1-p5";
+  return "4.0.1-p6";
 }