Adapted from https://sourceforge.net/p/docpp/patches/1/

--- doc++-3.4.10/src/comment.ll	2000-06-24 18:50:23.000000000 +0200
+++ doc++-3.4.10/src/comment.ll	2012-09-17 11:14:50.744922841 +0200
@@ -24,7 +24,7 @@
 
 #include <assert.h>
 #include <ctype.h>
-#include <iostream.h>
+#include <iostream>
 #include <stdarg.h>
 #include <stdio.h>
 
--- doc++-3.4.10/src/cpp.ll	2002-05-09 08:11:14.000000000 +0200
+++ doc++-3.4.10/src/cpp.ll	2012-09-17 11:15:21.184333236 +0200
@@ -26,7 +26,7 @@
 
 #include <assert.h>
 #include <ctype.h>
-#include <iostream.h>
+#include <iostream>
 #include <stdarg.h>
 #include <stdio.h>
 
--- doc++-3.4.10/src/datahashtable.h	2000-08-27 21:44:34.000000000 +0200
+++ doc++-3.4.10/src/datahashtable.h	2012-09-17 11:22:59.442589960 +0200
@@ -26,11 +26,13 @@
 #define _DATAHASHTABLE_H
 
 #include <assert.h>
-#include <iostream.h>
+#include <iostream>
 #include <stdlib.h>
 
 #include "McDArray.h"
 
+using namespace std;
+
 /* This should be a private subclass of #DataHashTable#. However, since cfront
    is not able to compile this constrution, we had move the class to global
    scope.
--- doc++-3.4.10/src/doc2dbsgml.ll	2002-05-09 08:11:14.000000000 +0200
+++ doc++-3.4.10/src/doc2dbsgml.ll	2012-09-17 11:20:49.077259414 +0200
@@ -22,8 +22,8 @@
 
 %{
 #include <assert.h>
-#include <fstream.h>
-#include <iostream.h>
+#include <fstream>
+#include <iostream>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
@@ -36,6 +36,8 @@
 #undef	YY_INPUT
 #define	YY_INPUT(buf, result, max_size) result = yyread(buf, max_size);
 
+using namespace std;
+
 static Entry*	current;
 static int	inPos;
 static int	lastContext;
--- doc++-3.4.10/src/doc2dbxml.ll	2002-05-09 08:11:14.000000000 +0200
+++ doc++-3.4.10/src/doc2dbxml.ll	2012-09-17 11:20:22.264831159 +0200
@@ -25,8 +25,8 @@
 
 %{
 #include <assert.h>
-#include <fstream.h>
-#include <iostream.h>
+#include <fstream>
+#include <iostream>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
@@ -39,6 +39,8 @@
 #undef	YY_INPUT
 #define	YY_INPUT(buf, result, max_size) result = yyread(buf, max_size);
 
+using namespace std;
+
 static Entry*	current;
 static int	inPos;
 static int	lastContext;
--- doc++-3.4.10/src/doc2html.ll	2000-07-17 23:17:24.000000000 +0200
+++ doc++-3.4.10/src/doc2html.ll	2012-09-17 11:22:40.354469631 +0200
@@ -29,6 +29,8 @@
 #include "doc.h"
 #include "nametable.h"
 
+using namespace std;
+
 extern NameTable	gifs;
 
 #define YY_DECL int yylex()
--- doc++-3.4.10/src/doc2tex.ll	2000-11-05 17:21:16.000000000 +0100
+++ doc++-3.4.10/src/doc2tex.ll	2012-09-17 11:23:22.210701715 +0200
@@ -23,8 +23,8 @@
 
 %{
 #include <assert.h>
-#include <fstream.h>
-#include <iostream.h>
+#include <fstream>
+#include <iostream>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
@@ -38,6 +38,8 @@
 #undef	YY_INPUT
 #define	YY_INPUT(buf, result, max_size) result = yyread(buf, max_size);
 
+using namespace std;
+
 static Entry*	current;
 static int	inPos;
 static int	lastContext;
--- doc++-3.4.10/src/doc.ll	2000-09-17 21:41:17.000000000 +0200
+++ doc++-3.4.10/src/doc.ll	2012-09-17 11:15:37.068009454 +0200
@@ -23,8 +23,8 @@
 
 %{
 #include <assert.h>
-#include <fstream.h>
-#include <iostream.h>
+#include <fstream>
+#include <iostream>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
--- doc++-3.4.10/src/equate.cc	2002-05-02 21:13:10.000000000 +0200
+++ doc++-3.4.10/src/equate.cc	2012-09-17 11:25:42.850669366 +0200
@@ -23,9 +23,9 @@
 
 #include "config.h"
 
-#include <fstream.h>
+#include <fstream>
 #include <getopt.h>
-#include <iostream.h>
+#include <iostream>
 #include <stdio.h>
 #include <string.h>
 
--- doc++-3.4.10/src/html.cc	2001-02-17 07:34:49.000000000 +0100
+++ doc++-3.4.10/src/html.cc	2012-09-17 11:24:07.978824681 +0200
@@ -31,7 +31,7 @@
 #include <direct.h>
 #endif
 #include <errno.h>
-#include <iostream.h>
+#include <iostream>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
--- doc++-3.4.10/src/java.ll	2001-11-25 18:04:12.000000000 +0100
+++ doc++-3.4.10/src/java.ll	2012-09-17 11:24:19.138834603 +0200
@@ -26,7 +26,7 @@
 
 #include <assert.h>
 #include <ctype.h>
-#include <iostream.h>
+#include <iostream>
 #include <stdio.h>
 
 #include "doc.h"
--- doc++-3.4.10/src/main.cc	2002-05-09 08:11:14.000000000 +0200
+++ doc++-3.4.10/src/main.cc	2012-09-17 11:25:30.650719070 +0200
@@ -25,7 +25,7 @@
 #include "config.h"
 
 #include <assert.h>
-#include <fstream.h>
+#include <fstream>
 #include <getopt.h>
 #include <locale.h>
 #include <stdio.h>
--- doc++-3.4.10/src/nametable.cc	2000-04-08 23:11:54.000000000 +0200
+++ doc++-3.4.10/src/nametable.cc	2012-09-17 11:25:58.894591128 +0200
@@ -22,7 +22,7 @@
 */
 
 #include <assert.h>
-#include <iostream.h>
+#include <iostream>
 #include <stdlib.h>
 #include <string.h>
 
--- doc++-3.4.10/src/nametable.h	2000-04-08 23:11:56.000000000 +0200
+++ doc++-3.4.10/src/nametable.h	2012-09-17 11:22:07.826207198 +0200
@@ -25,7 +25,7 @@
 #define	_NAME_TABLE_H
 
 #include <assert.h>
-#include <iostream.h>
+#include <iostream>
 
 #include "datahashtable.h"
 
--- doc++-3.4.10/src/php.ll	2001-02-16 23:34:47.000000000 +0100
+++ doc++-3.4.10/src/php.ll	2012-09-17 11:25:18.582759801 +0200
@@ -23,7 +23,7 @@
 %{
 #include <assert.h>
 #include <ctype.h>
-#include <iostream.h>
+#include <iostream>
 #include <stdio.h>
 
 #include "doc.h"
--- doc++-3.4.10/src/tex2gif.cc	2001-08-07 20:55:40.000000000 +0200
+++ doc++-3.4.10/src/tex2gif.cc	2012-09-17 11:26:06.698547836 +0200
@@ -21,8 +21,8 @@
   Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */
 
-#include <iostream.h>
-#include <fstream.h>
+#include <iostream>
+#include <fstream>
 #include <stdio.h>
 #include <string.h>