0.5.1 -
	- fix a big bug in the check_library function, inminent release!
	- make sure LIL_ENDIAN is 0 or 1
	- fix a bug on endianness check '\n' char
	- fix a bug on string concatenation

0.5 - ?
	#- overview -#
	- final script is now serialized. No stages now.
	- lot of portability fixups and code cleanup.
	- hide code blocks by ##MARKS## in files handled by SUBDIRS.
	- add libtool support.
	- strip support for acr: smaller scripts for nested purposes.
	- amr is now in semi-usable stage.
	- better flags parse (getopt)
	- better ruby support.
	- add perl threads support.
	- guess_os now uses config.guess if it exists.
	- cleaner debug output
	- add support to include modules.
	- new commands: DIENOW, IFOR, IFNOTOR, INCLUDE, CHKUSR, CHKGRP
	- deprecated commands: USE_BACKUP, LOCAL, GLOBAL

	#- detailed -#
	- less 'cat' usage.
	- add acr -g (print out autogen.sh)
	- Fixes on acr -m and amr -m
	- AMR complete support for really basic C projects.
	- Documentation fixups
	- VPATH subst now creates the directories correctly
	- functionalize the CHKLIB and CHKINC
	- Deprecate the '<-' assignation. similar to IFEQVAL
	- Deprecate the IFEQVAL keyword in pro to IFEQ
	- Initial import of functionalized checks for includes
	- acr-vim plugin installation script now comes with -force
	- One word comments has been deprecated.
	- New comment style that looks closer to C ( /* .. */ )
	- Standarize SIZEOF varnames to GNU like ones
	- SIZEOF now supports emphasys with '!'
	- SIZEOF ; now exports HAVE_SIZEOF_* to 0 or 1
	- Some fixups for the acr -m
	- Some fixups on Makefile generation by AMR
	- initial import of amr-tutorial
	- minor typo fix on src/acr help message
	- sync vim syntax plugin for the new commands
	- fix LANG_JAVA for the new ARG_* rules
	- simplify conditionals
	- major cleanup of variable usage
	- HAVE_CLASSPATH_foo is now exported by CHK_CP
	- ARG_* allows to work with flag or by environ
	- refix perl-threads support
	- chkprg now checks if varname is a valid executable before PATH search
	- sync ARG_* usage for the manpage
	- add some examples in configure.acr(5)
	- PKGCFG exports a HAVE_PKGCFG_blabla variable
	- fix tr portability
	- simplify the _REQUIRED variable abuse
	- add enter_mode function to simplify the blobs
	- documentation the new stuff of chkver
	- deprecate USE_BACKUP command and sync documentation.
	- enhace test.sh script and documentation for unitary tests
	- export HAVE_(pkg-config-name)_VERSION_(version-number) in chkver
	- implement ! in CHKVER command
	- export RUBY and RUBY_VERSION with LANG_RUBY
	- Fix ruby and python module checks when no ruby/python found.
	- Check ACR_RMFILES in do_remove before rm anything
	- Move examples/csharp.acr to modules/
	- Refresh examples to pass unit tests (make test)
	- Whoops missing mode-callback defined for CHK_PY
	- Make use of config.guess when exists
	- Stop parsing when invalid operation on assignment
	- Cleaner debug output
	- Implement the string mode. Faster string concat and better debug output.
	- Reread all the code to reduce some expressions and drop unused code
	- Add HAVE_PROGNAME foreach CHKPRG (repercutes on USE_LIBTOOL)
	- fix DIENOW command
	- deprecate LOCAL and GLOBAL commands
	- add LIBTOOL_STATIC export for USE_LIBTOOL command
	- fix acr homepage everywhere
	- call do_remove everytime a compilation failes
	- add configure.amr(5) manpage
	- Implement more stuff on AMR, basic usage and documentation.
	- Some minor size optimization (about 130 bytes)
	- Add new way to DIE: DIENOW
	- Rename DIE to DIEIF and DIENOT to DIEIFNOT (usability)
	- New conditional keywords IFOR and IFNOTOR
	- Fix check command to match the new infrastructure
	- Add support for multiple includes (foo.h+bar.h)
	- Fix a problem with the BSD awk and shell (fixes CHKPRG)
	- unknown flags are handled as warnings instead of fatal errors.
	- fix percentatge '%' usage in SCRIPT (fixes SIZEOF bug)
	- also export [HOST|BUILD|TARGET]_[CPU|OS]
	- Beutify the progress bar when including modules.
	- Warn on un-supported flags passed to the ./configure
	- Documentate and securize INCLUDE keyword.
	- Add INCLUDE keyword.
	- flags now uses the standard value when no argument is passed.
	- add CHKUSR and CHKGRP commands.
	- add 'doc/flag-arguments' file.
	- show default arg_* value in FLAGREPORT and --help
	- Redefine a new standard for ARG_* commands.
	- Check foreach variable definition.
	- Fix '!' token for LANG_*
	- Use 'cut' instead of 'awk in some places.
	- Fix distribution file creation code inside the acr-sh
	- use ${PERL} instead of perl.
	- Fix perl support again (serialization must be done in the SCRIPT).
	- fix NKEYS insanity.
	- drop LOCAL/GLOBAL keywords. Now handled by a serialization.
	- add GPL license in the proper way.
	- Cleanup of unused variables
	- check includes and libraries supported by C and C++
	- change URL to the current one
	- fix all licensing stuff.
	- rename LICENSE -> COPYING
	- use vim foldering
	- Move all keywords to a single case statement
	- Serialize script generation (!!)
	- call command -v from other shell () or sh -c.
	- install 'amr'
	- add -s in 'acr' to strip default code.
	- fixups for amr (best cdeps prediction, fix cdeps in report)
	- reuse for USE_BACKUP
	- use MODE instead of huge IF (4% faster) (needs testing)
	- fixups for CHECK_PROG (error string and argument handler)
	- add libtool support (USE_LIBTOOL and USE_LIBTOOL!)
	- initial import of amr (the auto make replacement)
	- use getopt to fetch arguments from command line
	- add hidden blocks by using ##MARKS## in SUBDIRS
	- Add support for ObjectiveC
	- drop /-n/ in conditionals
	- incremented performance by using the arithmetic extension $((aOPb))
	- reduced configure size by using : {FOO:=BAR}

0.4 - 20050921
	#- overview -#
	- added 'else'
	- support for contexts
	- added a reverse engineering tool to recover .acr files from the final
	  script generated by acr.
	- progressbar added 
	- lot of fixes
	- better documentation
	- more debugging information
	- possibility to get the value of the target variable
	- enhanced java support
	- add ruby language support
	- adopt GNU like crosscompile
	- add CHECK_ENDIAN
	- support for multiple library checks
	- now SUBDIRS supports files.acr as targets
	- syntax highlighting for VIM
	- acr -D creates the dist tarball of the project
	- new command: install-acr
	- support for standard variable definitions (VAR = VALUE)

	#- detailed -#
	- ppc -> powerpc
	- install script for vim syntax highlighting scripts
	- autodetect GNU systems in $GNU variable (-gnu)
	- add -w flag
	- support for "" and '' values (null string value)
	- force strict new standard variable definitions
	- add checks before creating files (clean crash)
	- support for standard variable definitions (VAR = VALUE)
	- add install-acr manpage
	- type some install-acr stuff.
	- doc+man CHECK command
	- initial import of install-acr
	- order help flags in manpage
	- add '-D' flag --dist . creates a tar.gz from a configure.acr project
	- fix '-n' flag.
	- create src/vim to store the VIM syntax highlighting plugin
	- add REPORT in manpage!!
	- fix manpage PKG_CONFIG -> PKGCONFIG
	- doc SUBDIRS+files, dislike SUBST_FILES :P
	- alphabetically ordened --help flags.
	- add .PHONY in /acr -m/ mode and Makefile
	- fix 'command not found' in EXEC when command is not found.
	- DIE works for "1" and non "0" strings, DIENOT for "0" and ""
	- also allow --r flag as --report alias
	- add sunos, syllable on USE_DL
	- fi'smiley-ascii art %)
	- check for dupped USE_DL
	- SUBDIRS support for target files
	- do not overwrite on failed attempts (src/acr)
	- add INSTALL_LIB and INSTALL_MAN envwords
	- <- operator fixed
	- add INCLUDEDIR into the ENVWORDS
	- allows multiple libs checks CHKLIB c+m
	- support for multiple libs checks
	- LD_LIBS -> DL_LIBS
	- conditional bugs fix
	- update autogen.sh to do things well
	- change --version message
	- add doc for endianness checks with ACR. (doc/endian)
	- fixes the use of '*' in SIZEOF kw
	- crosspath+vpath+subst_files bug fixed. (read doc/crosspath-build FMI)
	- add ENDIAN | CHECK_ENDIAN keywords
	- awk -> expr for sums optimizations
	- all language bindings renamed from CHK to CHK_
	- add [!] mode for each CHK_
	- add RUBY extensions check support
	- add RUBY support
	- adopt GNU like crosscompile (thx2jemarch ;)
	- fix cpp 2.9x problem
	- fix relative path bug for VPATH
	- fix VPATH bug for subdirs. (thx sepharad)
	- fix gnu-awk warnings
	- drop external program executions
	- use_pthread requires lang_c
	- drop cats from the house. (optimization)
	- use_pthreads requires lang_c
	- fix OS-X eval bug
	- autoexport cflags-ldflags on pkgconfig
	- added automatic context switching ( local inside {} )
	- add_envword fixups and optimization
	- changelog separation in overview/detailed
	- more integration in context and nested concepts.
	- add }{ and }ELSE{ aliases to branch alternative conditionals.
	- fix 102% bug :)
	- optimize progressbar
	- better syntax documentation
	- documentate contexts
	- add LOCAL and GLOBAL contexts to manage definitions ( =,+=...)
	- documentate IFEQVAL
	- documentate nested conditionals
	- add nested conditionals '{' and '}' keywords.
	- hide last NOP command in debug
	- fix mktemp portability bug
	- drop CVS tags from dist file
	- catch control-c in acr (remove tmp file)
	- update make test to use -p
	- add CSHARP example (may help someone :)
	- add progressbar (-p|--progress-bar)
	- split gmake into env_gmake and use_gmake
	- fix MAKE stuff, GMAKE=0|1
	- add REPORT_TOOLS
	- new debug output format
	- use numberline in errors
	- add -n|--do-nothing flag into acr
	- add wordcounter for better debugging
	- add <- operator.
	- allow to get value of variables (<-VAR)
	- one word comments support '#.*' (manpage)
	- add embed support to acr-recover
	- add -e|--embed to acr
	- add acr-recover manpage
	- add metadatas for acr -r
	- add_envword cleanup
	- show prefix in ./configure output
	- initial import of acr-recover
	- update software signature in acr
	- add -r|--recovery flag into acr
	- add -o|--output flag into acr
	- documentate sizeof, add example, update manpage
	- fix whitespace before ';' in manpages
	- add SIZEOF command
	- add '((' '))' comments
	- add <- definition. (get value of varname xx)
	- add warnings for dupped exported variables
	- add warnings for common typos
	- add doc/make-tips
	- add SUBST alias for SUBST_FILES
	- fix REPORT_CXX
	- fine get environment procedure (add_envword)
	- move ENDSCRIPT before IFSCRIPTS
	- split SEDFLAGS into different args (to be POSIX compliant)
	- use mv -f to avoid user interactivity
	- make pkg-config continue when no executable or package found.
	- add EXPORT_DEFINED - to export only the defined variables (!""||0)
	- fix EOF bug when configure.acr ends with one-word keyword. 
	- add NOP keyword.
	- fix .h creation when VPATH is used.
	- Be autodetected by url2pkg from pkgsrc.
	- add CHECK_CLASSPATH_REQUIRED
	- fix sub -> gsub (reported by sepharad)
	- add syntax tips into configure.acr

0.3 - 20050421
	- sync documentation and manpages
	- add NOBACKUP command to drop .backup stuff
	- unsubst gnumake-function integration with -m flag
	- add 'security' check in SUBST_FILES by adding .backup and .orig
	- `-> read doc/backup FYI
	- fix ENVWORDS on env_java
	- add S|H|SH_FILES into clean target makefile generation
	- change all !"" to -z or -n 
	- use command instead of my_whereis
	- use (exec) instead of direct access to the cmd. (netbsd sh tip)
	- check pthread_testcancel for PTHREADS and HAVE_LIBS=1
	- register pthread into REQUIRED/OPTIONAL report
	- add REQUIRE_ACR_VERSION.
	- few documentation for acr hackers
	- my_whereis checks for -x instead of -e
	- switch from '-e' to '-f' (portability)
	- fix jsh problem with [ -e '' ] (Solaris)
	- LANG_PYTHON, CHK_PY documented into manpage
	- simple process messages (creating...)
	- add manpage entries for PYTHON and IF*
	- more fixes on --help message
	- add IFNULL and IFNOTNULL
	- all conditional strings ends with ';'
	- add IFEQVAL / IFNOTEQVAL conditional
	- some conditional codes rewritted
	- allow the use of \; on strings
	- add 'concat' function for readibility
	- conditional documentation added.
	- major conditional syntax changes
	- export HAVE_LANG_xxx after check each language.
	- fix tabspaced flags (now uses spaces, support for long variable names)
	- fix env_% envwords
	- *WARNING* further change makes acr to break backward compat. *WARNING*
	- split all language supports into required and supported (''/'!')
	- fix env_c to take CFLAGS and LDFLAGS
	- Entire rewrite of acr cmdline parser
	- Use IS_KEYWORD for unexpected EOF.
	- fix --help returns when no lang defiend.
	- boolean flags also reset the value at the end of script.
	- fix IFAND/IFNOTAND. It doesn't does what manpage says.
	- fix CHKINC bug (doesn't check CFLAGS), doesn't uses HAVE_PROGS.
	- fix bug parsing cmdline flags. (eval)
	- more info in 'SUPPORT' file
	- Hide errors when no pkg-config is found.
	- Fix sh-portability tips on pkg-config stuff
	- drop QUITE flag (-q, --silent, --quite) no sense
	- add sandbox documentation
	- Add --sandbox for sandboxed installs
	- Cleaner (tabs) --report output.
	- Some --help message fixups.
	- USE_JNI must depends on LANG_C
	- Use JAVA_HOME for javac checks
	- Add envhelp for java
	- initial crosscompile support (doc/crosscompile)
	- add LANG_PYTHON and CHECK_PYTHON_MODULE
	- fix missing keyword on manpage
	- drop autoconf compatibility command.
	- fix end with word bug.
	- add JNI support.
	- add CHKCP for classpath checks.
	- catch control-c, centralize temporaly files.
	- fixups for report langs
	- drop test target from 'all' target.
	- better makefile generation
	- best c++ checks
	- fix remove of temporally lang files.
	- fix mar references in doc

0.2 - 20050220
	- fix version string
	- fix some problems with add_flag
	- fix variable overwritting bug
	- drop --oldincludedir
	- fix for REPORT (-r) cleanup output
	- Create manpages
	- Rename some commands
	- Add EXEC command
	- Add INSTALL_* environs
	- Fix environ code using test -z
	- Drop SHAREDSTATEDIR and OLDINCLUDEDIR from environ (deprecated)
	- Fix standard SH tips for portability
	- Add -m to acr wrapper to create Makefile.acr
	- Add PERL support (PERL_THREAD,USE_PERL,CHK_PM)
	- Fix sed expression bug
	- Add --report|-r flag to the final ./configure
	- add USE_X11 directive
	- add LANG_TCL and USE_TK
	- check length of --flags for clean --help output
	- add USE_ICONV USE_DL
	- add more --help typos
	- add USE_PTHREAD command
	- autodetect .orig files in subst stage
	- catch [C|LD]FLAGS as exportable ones
	- Add PKGCFG command
	- Add -x flag for cmdline execution
	- Check version of libraries
	- Add ?= assignation
	- Add IF[*]+ commands
	- Add -d flag for Debugging mode
	- Solve SED portability problems
	- Set SH to the bash when LANG_BASH is defined.
	- Add support for crosspath buildings
	- Add support for '##'/'##' comments
	- Add SUBCONF directive
	- Add new examples
	- Add the EXPORT directive
	- Split HOST BUILD TARGET into _OS and _CPU and export them
	- Conditional assignation now is an array
	- Fix assignations spaces tip
	- Renamed from MAR to ACR
	- Add DIE/DIENOT crash commands
	- Add IF/IFNOT/IFAND conditional scripts
	- Add AUTOCONF directive to enable some GNU compatibility
	- Solve ENVWORDS stage bug.
	- Solve problems checking libs against CFLAGS/LDFLAGS
	- Create mar and mar-sh scripts separattely (userfriendly)
	- Add cmdline flags to mar
	- Add documentation and tutorials
	- Errors piped to stderr
	- Add VERSION and PKGNAME to ENVWORDS
	- Solve my_whereis problem
	- Separate CHECKLIB functionality into CHECK_LIB and CHECK_FUNC

0.1 - 2004/11/27
	- Initial release