+* Noteworthy changes in release ?.? (????-??-??) [?]
+
+** Future changes:
+
+ The next major release will drop support for generating parsers in K&R C,
+ and remove the definition of yystype (removal announced since Bison
+ 1.875).
+
+** Changes in regular C parsers (yacc.c):
+
+*** The generated header is included
+
+ Instead of duplicating the content of the generated header (definition of
+ YYSTYPE, yyltype etc.), the generated parser now includes it, as was
+ already the case for GLR or C++ parsers.
+
+* Noteworthy changes in release 2.5.1 (2012-06-05) [stable]
+
+** Future changes:
+
+ The next major release will drop support for generating parsers in K&R C.
+
+** yacc.c: YYBACKUP works as expected.
+
+** glr.c improvements:
+
+*** Location support is eliminated when not requested:
+
+ GLR parsers used to include location-related code even when locations were
+ not requested, and therefore not even usable.
+
+*** __attribute__ is preserved:
+
+ __attribute__ is no longer disabled when __STRICT_ANSI__ is defined (i.e.,
+ when -std is passed to GCC).
+
+** lalr1.java: several fixes:
+
+ The Java parser no longer throws ArrayIndexOutOfBoundsException if the
+ first token leads to a syntax error. Some minor clean ups.
+
+** Changes for C++:
+
+*** C++11 compatibility:
+
+ C and C++ parsers use "nullptr" instead of "0" when __cplusplus is 201103L
+ or higher.
+
+*** Header guards
+
+ The header files such as "parser.hh", "location.hh", etc. used a constant
+ name for preprocessor guards, for instance:
+
+ #ifndef BISON_LOCATION_HH
+ # define BISON_LOCATION_HH
+ ...
+ #endif // !BISON_LOCATION_HH
+
+ The inclusion guard is now computed from "PREFIX/FILE-NAME", where lower
+ case characters are converted to upper case, and series of
+ non-alphanumerical characters are converted to an underscore.
+
+ With "bison -o lang++/parser.cc", "location.hh" would now include:
+
+ #ifndef YY_LANG_LOCATION_HH
+ # define YY_LANG_LOCATION_HH
+ ...
+ #endif // !YY_LANG_LOCATION_HH
+
+*** C++ locations:
+
+ The position and location constructors (and their initialize methods)
+ accept new arguments for line and column. Several issues in the
+ documentation were fixed.
+
+** liby is no longer asking for "rpl_fprintf" on some platforms.
+
+** Changes in the manual:
+
+*** %printer is documented
+
+ The "%printer" directive, supported since at least Bison 1.50, is finally
+ documented. The "mfcalc" example is extended to demonstrate it.
+
+ For consistency with the C skeletons, the C++ parsers now also support
+ "yyoutput" (as an alias to "debug_stream ()").
+
+*** Several improvements have been made:
+
+ The layout for grammar excerpts was changed to a more compact scheme.
+ Named references are motivated. The description of the automaton
+ description file (*.output) is updated to the current format. Incorrect
+ index entries were fixed. Some other errors were fixed.
+
+** Building bison:
+
+*** Conflicting prototypes with recent/modified Flex.
+
+ Fixed build problems with the current, unreleased, version of Flex, and
+ some modified versions of 2.5.35, which have modified function prototypes.
+
+*** Warnings during the build procedure have been eliminated.
+
+*** Several portability problems in the test suite have been fixed:
+
+ This includes warnings with some compilers, unexpected behavior of tools
+ such as diff, warning messages from the test suite itself, etc.
+
+*** The install-pdf target works properly:
+
+ Running "make install-pdf" (or -dvi, -html, -info, and -ps) no longer
+ halts in the middle of its course.
+
+* Changes in version 2.5 (2011-05-14):
+
+** Grammar symbol names can now contain non-initial dashes:
+
+ Consistently with directives (such as %error-verbose) and with
+ %define variables (e.g. push-pull), grammar symbol names may contain
+ dashes in any position except the beginning. This is a GNU
+ extension over POSIX Yacc. Thus, use of this extension is reported
+ by -Wyacc and rejected in Yacc mode (--yacc).
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