As I am fixing some of the C++ ports for GCC 3.2, I found a problem with lex.
The following patch is required for lex to generate code which
can compile with GCC 3.2.  It applies to /usr/src/usr.bin/lex

--- flex.skl.orig       Sat Sep  7 23:44:38 2002
+++ flex.skl    Sat Sep  7 23:45:06 2002
@@ -26,7 +26,8 @@
 #include <stdlib.h>
-class istream;
+#include <iosfwd>
+using namespace std;
 #include <unistd.h>

For Standard C++, you cannot forward declare istream as:
class istream;

because in Standard C++, istream is a typedef for a template:
  typedef basic_istream<char>           istream;

The correct fix is to include <iosfwd>.  Under gcc 2.95,
<iosfwd> forward declares istream as "class istream;" and
under gcc 3.2, <iosfwd> forward declares istream as the typedef.

The "using namespace std;" is required because in gcc 3.2, istream
is in the std namespace.  In gcc 2.95, this line will be benign.
Craig Rodrigues        

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