diff -Naur bc-1.07.1-orig/bc/main.c bc-1.07.1/bc/main.c
--- bc-1.07.1-orig/bc/main.c	2017-04-07 17:20:02.000000000 -0500
+++ bc-1.07.1/bc/main.c	2022-01-10 22:00:50.009302332 -0600
@@ -33,6 +33,10 @@
 #include "proto.h"
 #include "getopt.h"
 
+#ifdef _WIN32
+#include <io.h>
+#include <fcntl.h>
+#endif
 
 /* Variables for processing multiple files. */
 static char first_file;
@@ -171,7 +175,10 @@
   if (isatty(0) && isatty(1)) 
     interactive = TRUE;
 
-#ifdef HAVE_SETVBUF
+#ifdef _WIN32
+  _setmode(_fileno(stdout), _O_BINARY);
+  (void)setvbuf(stdout, NULL, _IONBF, 0);
+#elif defined(HAVE_SETVBUF)
   /* attempt to simplify interaction with applications such as emacs */
   (void) setvbuf(stdout, NULL, _IOLBF, 0);
 #endif