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+*** Major changes in libio version 2.7.0:
+
+* The data representations of _IO_FILE and streambufs have been modified.
+  The layout of the jump-table table _IO_jumps_t has been re-arranged
+  to match that of a virtual function table of a streambuf.  Therefore,
+  we no longer need a separate _IO_FILE::_jumps pointer;  instead it can
+  be shared with the virtual function table pointer.  In addition to
+  saving space, this also removes the overhead when double indirection
+  was needed, and there are many simplificatons (e.g. we no longer need
+  the builtinbuf class.
+
+* The streambuf::uflow virtual has been added, to match the standard.
+
+* The ifstream, ofstream, and fstream classes now include the filebuf
+  as a member, rather than being pointed to it.  Various related changes.
+
+* Version number changed to generally follow libg++ (and gcc).
+
+*** Major changes in libio version 0.66 (released with libg++ 2.6.1):
+
+* Some documentation and an example in iostream.texi on how to derive
+ your own class from streambuf.
+
+* New functions added to stdio:  getline, detdelim, snprintf, vsnprintf.
+  This is for compatibility with the GNU C library.
+
+*** Major changes in libio version 0.65 (released with libg++ 2.6):
+
+* _IO_getline and streambuf::sgetline no longer write a '\0' at the end.
+
+* A number of improvements to get closer to the ANSI/ISO C++ working
+paper, such as:
+- Added (preliminary support for) new ANSI streambuf::uflow virtual.
+- Added istdiostream and ostdiostream classes.
+- Added ostream::operator<<(bool) and istream::operator>>(bool&).
+
+* More robust (and faster) initialization and cleanup of standard streambufs.
+
+* Many small bug fixes, portability improvements, and random enhancements.
+
+*** Major changes in libio version 0.63 (released with libg++ 2.5.3):
+
+* There is a g++ bug that causes inconsistent name mangling for the
+assembler name of the virtual function table for the istream class.
+A work-around has been put into streambuf.h, which will make g++
+always do the right thing.  Note that this may require you to
+recompile programs that were incorrectly compiled by g++.
+
+* Functions that do printf-style formatting to the unbuffered
+streams have been optimized to write to a temporary buffer.
+