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+flex (2.6.1-1.1) unstable; urgency=medium
+
+   In this upload, the flex package drops its dependency on libfl-dev, because
+   it is impossible to forward the correct architecture constraint. It contains
+   the FlexLexer.h header and is thus required for using the FlexLexer C++
+   interface. Packages using this library need to add libfl-dev to their
+   Build-Depends.
+
+ -- Helmut Grohne <helmut@subdivi.de>  Wed, 23 Nov 2016 13:18:32 +0100
+
+flex (2.5.33-7) unstable; urgency=low
+
+   This version of Flex is a major upgrade from previous versions. There
+   have been extensive changes. These changes require source changes in
+   lex input files.  The new direction flex is taking is to incorporate
+   new functionality at the expense of POSIX or backward
+   compatibility. This can also be considered part of the gcc migration
+   process; flex has been updated (the buggy, rickety set of patches
+   required to make it work with gcc was dumped in favour of a well
+   engineered upstream migration).
+
+   Flex scanners are now reenterant, you may have multiple scanners in
+   the same program with differing sets of defaults, and they play
+   nicer with modern C and C++ compilers. C++ scanners are compatible
+   with recent c++ compilers (conform to ANSI C++, gcc 3.2), supports
+   bison variables yylval and yylloc. Some variables have been
+   renamed. Flex generates C99 defs now, see YY_TRADITIONAL_FUNC_DEFS.
+   yylineno is present in all scanners. yylineno is per-buffer in
+   reentrant scanners. Flex tries its best to output only the relevant
+   portions of the skeleton when generating a scanner, thus avoiding as
+   much conditional compilation as possible
+
+   The signature of all functions has changed. flex has new command line
+   options, and option parsing has changed (now also supports POSIX
+   conventions optionally). Handles POSIXLY_CORRECT environment
+   variable.  Various i18n translations are included in the
+   distribution. Flex now works with recent bison versions.  The new
+   scanners do not polllute the global name space, and thus macros that
+   used to be available to user code are no longer present.
+
+   Flex has gained an extensive new test suite run at build time to test
+   for regressions. The flip side is that Flex no longer conforms to the POSIX lex
+   behaviour, and the scanners require conforming implementations when
+   flex is used in ANSI C mode. Flex has broken backwards
+   compatibility. This is not a bug, but done deliberately, by
+   design.
+
+   The package flex-old provides the same behaviour as version 2.5.4a of
+   Flex.
+
+   Please make sure you are prepared for these changes in Flex
+   before continuing with its upgrade.
+
+ -- Manoj Srivastava <srivasta@debian.org>  Fri, 31 Oct 2003 21:53:16 -0600
+