diff -ur bash-3.2.orig/config.h.in bash-3.2/config.h.in
--- bash-3.2.orig/config.h.in	2006-09-12 23:00:54.000000000 +0300
+++ bash-3.2/config.h.in	2007-12-30 15:41:05.974625000 +0200
@@ -812,6 +812,13 @@
 /* Define if you have the wcwidth function.  */
 #undef HAVE_WCWIDTH
 
+/* Define if you have the fpurge function.  */
+#undef HAVE_FPURGE
+
+/* Define if you have the __fpurge function.  */
+#undef HAVE___FPURGE
+
+
 /* Presence of certain system include files. */
 
 /* Define if you have the <arpa/inet.h> header file. */
diff -ur bash-3.2.orig/configure.in bash-3.2/configure.in
--- bash-3.2.orig/configure.in	2006-09-26 18:05:45.000000000 +0300
+++ bash-3.2/configure.in	2007-12-30 15:14:52.206078000 +0200
@@ -721,6 +721,9 @@
 AC_CHECK_DECLS([strcpy])
 AC_CHECK_DECLS([strsignal])
 
+dnl checks for fpurge or __fpurge
+AC_CHECK_FUNCS(fpurge __fpurge)
+
 dnl Extra test to detect the horribly broken HP/UX 11.00 strtold(3)
 AC_CHECK_DECLS([strtold], [
     AC_MSG_CHECKING([for broken strtold])
diff -ur bash-3.2.orig/redir.c bash-3.2/redir.c
--- bash-3.2.orig/redir.c	2006-05-24 05:31:35.000000000 +0300
+++ bash-3.2/redir.c	2007-12-30 16:35:53.627539000 +0200
@@ -31,6 +31,18 @@
 #include "filecntl.h"
 #include "posixstat.h"
 
+
+/* check for a way to clear the output buffer of a FILE *, for use
+   after dup on stdout/stderr */
+#undef	FPURGE
+#ifdef	HAVE___FPURGE
+#define	FPURGE	__fpurge
+#endif
+#ifdef	HAVE_FPURGE
+#define	FPURGE	fpurge
+#endif
+
+
 #if defined (HAVE_UNISTD_H)
 #  include <unistd.h>
 #endif
@@ -769,6 +781,19 @@
 	  if ((fd != redirector) && (dup2 (fd, redirector) < 0))
 	    return (errno);
 
+
+/* if possible, and the redirecting stdout/stderr, clear the stdio
+   output buffers, so output from shell builtins that previously
+   failed will not go to the redirected file */
+#ifdef	FPURGE
+	      if (redirector == 1) {
+		  FPURGE(stdout);
+	      } else if (redirector == 2) {
+		  FPURGE(stderr);
+	      }
+#endif
+
+
 #if defined (BUFFERED_INPUT)
 	  /* Do not change the buffered stream for an implicit redirection
 	     of /dev/null to fd 0 for asynchronous commands without job
@@ -851,6 +876,19 @@
 		  return (r);
 		}
 
+
+/* if possible, and the redirecting stdout/stderr, clear the stdio
+   output buffers, so output from shell builtins that previously
+   failed will not go to the redirected file */
+#ifdef	FPURGE
+	      if (redirector == 1) {
+		  FPURGE(stdout);
+	      } else if (redirector == 2) {
+		  FPURGE(stderr);
+	      }
+#endif
+
+
 #if defined (BUFFERED_INPUT)
 	      duplicate_buffered_stream (fd, redirector);
 #endif
@@ -890,6 +928,19 @@
 	  if (dup2 (redir_fd, redirector) < 0)
 	    return (errno);
 
+
+/* if possible, and the redirecting stdout/stderr, clear the stdio
+   output buffers, so output from shell builtins that previously
+   failed will not go to the redirected file */
+#ifdef	FPURGE
+	  if (redirector == 1) {
+	      FPURGE(stdout);
+	  } else if (redirector == 2) {
+	      FPURGE(stderr);
+	  }
+#endif
+	    
+
 #if defined (BUFFERED_INPUT)
 	  if (ri == r_duplicating_input || ri == r_move_input)
 	    duplicate_buffered_stream (redir_fd, redirector);