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+April 26, 1986
+
+Modified -- June 4, 1986
+Changed so that it automatically recognizes LaTeX source and ignores several
+environment modes such as array.
+
+
+Modified (Version 2.0) -- June 30, 1984
+Now handles white space in sequences like "\begin { document }". Detex is not
+as easily confused by such things as display mode ends and begins that don't
+match up.
+
+
+Modified -- September 19, 1986
+Added the "-e <environment-list>" option to ignore specified LaTeX
+environments.
+
+
+Modified -- June 30, 1987
+Added the "-n" no-follow option, to allow detex to ignore \input and \include
+commands. Also changed the algorithm for locating the input files. It now
+interprets the "." more reasonably (i.e. it is not always the beginning of an
+extension).
+
+
+Modified -- December 15, 1988
+Added handling of verbatim environment in LaTeX mode and added it to the list
+of modes ignored by default. Because of limitations with lex, it was
+necessary to shorten the names of some of the existing start states before
+adding a new one (ugh).
+
+
+Modified -- January 3, 1988
+Added ignore of \$ inside $$ (math) pair.
+
+
+Modified (Version 2.2) -- June 25, 1990
+Control sequences are no longer replaced by space, but just removed. This
+means accents no longer cause output words to be broken. The "-c" option was
+added to show the arguments of \cite, \ref, and \pageref macros. This is
+useful when using something like style on the output.
+
+
+Modified (Version 2.3) -- September 7, 1990
+Fixed the handling of Ctl mode a little better and added an exception
+for \index on suggestions from kcb@hss.caltech.edu (KC Border). Also
+changed the value for DEFAULTINPUTS to coincide with a local change.
+
+
+Modified -- February 10, 1991
+Added -t option to force TeX mode even when seeing the "\begin{document}"
+string in the input.
+
+
+Modified -- February 23, 1991
+Based on suggestions from pinard@iro.umontreal.ca (Francois Pinard), I
+added support for the SysV string routines (-DUSG), added defines for
+the flex lexical scanner (-DFLEX_SCANNER), changed NULL to '\0' when
+using it as a character (his sys defined NULL as (void *)0), changed
+the Makefile to use ${CC} instead of cc, and added comments about the
+new compile time options.
+
+
+Modified (Version 2.4) -- September 2, 1992
+Corrected the way CITEBEGIN worked. Due to serious braindeath I had
+the condition wrong in the if test. It should be (fLatex && !fCite).
+This solves the problem a couple people reported with amstex style
+\ref entries.
+
+Added a preprocessing sed(1) command to replace all the long, easy to
+read state names with short two letter state names (SA-S?) so that lex
+won't overflow and I don't have to keep shortening the state names
+every time I add one. If a state is added, it must also be added to
+states.sed (order is important) along with its unique S? replacement.
+
+Added \pagestyle, \setcounter, and \verb handling from
+K.Sattar@cs.exeter.ac.uk (Khalid Sattar). Also allows invocation as
+"delatex" to force LaTeX mode.
+
+Applied patches from queinnec@cenatls.cena.dgac.fr (Philippe Queinnec)
+to handle nested {}s in state <LaMacro2> (\bibitem, \cite, \index).
+
+Added special ligature handling (\aa, \ae, \oe, \l, \o, \i, \j, \ss)
+at the suggestion of gwp@dido.caltech.edu (G. W. Pigman II).
+
+Cleaned up the comments on detex.h, added mathmatica to DEFAULTENV.
+
+
+Modified (Version 2.5) -- January 28, 1993
+Leading spaces in macros are no longer stripped. This means
+"foo\footnote{ bar}" comes out as "foo bar" instead of "foobar".
+
+Fixed special ligature handling so it works in cases line {\ss} instead of
+just when followed by a space.
+
+
+Modified (Version 2.6) -- July 30, 1993
+Added OS/2 port from hankedr@mail.auburn.edu (Darrel R Hankerson).
+
+Added handling of leading and trailing ':' in TEXINPUTS per the latest
+TeX as suggested by jnp@tfl.dk (J|rgen N|rgaard).
+
+Changed the way the input path is constructed in SetInputPaths() so we
+never try to modify a constant string.
+
+Changed the way the the ignore environment list is contructed in
+SetEnvIgnore() so we never try to modify a constant string.
+
+Changed the USG define to HAVE_STRING_H.
+
+Fixed the states.sed script so it only replaces "Input" in the correct
+places. I would like to use the \< \> word separator patterns but
+they are not supported by all versions of sed. This as least works.
+
+Changed the detex.c target in the Makefile to use a temporary file
+because I experienced problems (segmentation fault) with lex on
+Solaris 2.1 when input was from stdin.
+
+
+Modified (Version 2.7) -- September 10, 1997
+Removed line breaks in detex.l between a few patterns and actions. It
+appears that flex is no longer able to handle this. Thanks to Anthony
+Harris <harris@hebb.neurology.pitt.edu> and Marty Leisner
+<leisner@sdsp.mc.xerox.com> for reporting this.
+
+
+Porting notes -- March 30, 1992
+When using gcc, or compiling on a NeXT, you should compile with
+-fwritable-strings. With the change to SetInputPaths() in 2.6 this
+should no longer be necessary.
+
+On a NeXT, it has been reported that lex replaces the '\0' with NULL,
+and then the compiler complains about it. I think this is an old bug
+that is no longer applicable.
+
+July 30, 1993
+The flex scanner generator does not work because it does not handle
+input buffering the same way as lex. I don't know of any reasonable
+way to rewrite detex to get around this problem.
+
+May 25, 1995
+According to alain@ia1.u-strasbg.fr (Alain Ketterlin), using flex
+allows 8-bit characters to be handled correctly.
+
+Modified (Version 2.8) -- January 1, 2008
+Added NCSA/University of Illinois Open Source License to facilitate
+free redistribution.
+
+(Version 2.8.1) -- October 2, 2008
+First version of OpenDetex.
+Making program compile on modern UNIX systems; many fixes in LaTeX
+code handling (quotes, figure and table environments, headings and
+many more).
+
+(Version 2.8.2) -- February, 2016
+Improved ANSI C compatibility. Used kpse_find_file() and
+kpse_program_name(). Handle `\kern', allow `em/ex'for dimensions,
+handle glue specs. Added the never-interactive option to prevent flex
+from creating a problematic prototype for isatty(). Renamed
+ERROR -> my_ERROR to avoid a conflict with WIN32 headers. Used binary
+mode for output file (Peter Breitenlohner and Werner Lemberg)
+
+Insert a space in place of right curly brace (Eric Miotto).
+
+Provide 'make uninstall'. Install man page when running 'make install'.
+
+(Version 2.8.3) -- February, 2018
+Added -r option that replaces math environments with nouns and verbs in a way that keeps sentences readable. Thanks to Sophie Huiberts.
+
+Changed Makefile to fix a Mac OS X problem where frequently an empty output file was produced.
+
+Removed states.sed that modified detex.l to avoid Lex memory overrun - no longer needed on current machines. Added detex.c to the distributed package to allow compiling OpenDetex without having Flex.
+
+Removed 'mathmatica' from the default list of environments which contents are ignored - 'mathmatica' is not supported by TeX. Added more ignored environments: algorithm, align, smallmatrix and several more.
+
+Fixed compilation on Cygwin.
+
+Removed special files for OS/2 - they required compilers that no longer exist. OpenDetex should be able to be compiled using GCC for OS/2.
+
+(Version 2.8.4) -- July, 2018
+
+Stoped generating additional spaces after commands (#41). Thanks to Martin Nowack.
+
+Fixed space missing in output when two newlines follow a macro (#42). Thanks to sgerwk.
+
+Started treating newlines in inline math as spaces (#45). Thanks to sgerwk.
+
+(Version 2.8.5) -- January, 2019
+
+Fixed man page on macOS (#47). Thanks to FX Coudert.
+
+Added -v option for showing version.
+
+(Version 2.8.6) -- January, 2020
+
+Fixed buffer overflow (CVE-2019-19601 #60). Thanks to Akira Kakuto, Norbert Preining and TeX Live team.
+
+(Version 2.8.7) -- June, 2020
+
+Reduced size of .tar.bz2 package by excluding object file added by mistake.
+
+Handle forcing placement with ! (#62). Thanks to schrc3b6.
+
+Added option to print source information with -1 (#64). Thanks to Victor Cacciari Miraldo.
+
+(Version 2.8.8) -- June, 2020
+
+Fixed compilation on old compilers supported by TeX Live (#65). Thanks to Akira Kakuto and Hironobu Yamashita.
+
+(Version 2.8.9) -- December, 2020
+
+Include escaped percent sign in output (#70). Thanks to Max Leonhardt.