Change in GNU Prolog version 1.4.5 (Feb 2018):

* fix a bug in soft-cut (when a cut appears in the if-part)
* fix bug when consulting multifile predicates with alternatives
* add ?- ISO prefix operator
* add gplc option --new-top-level (add top-level command-line option handling)
* fix a bug on linux witg gcc 6.3.0 (or binutils): needs PIC code
* fix a bug in findall/4
* fix a bug in select/5 under Windows
* fix a bug in the compiler
* fix a bug in read/1
* fix large address awarenes under cygwin32 (configure.in)
* improve memory limitation of acyclic_term/1
* improve term output (write/1 and friends)
* improve error handling for options (e.g. in write_term/3)
* fix bug with cut in the if-part of if-then(-else)
* fix port to x86_64/OpenBSD
  (machine kindly provided by Duncan Patton a Campbell)
* fix a bug with Apple/Yosemite gcc = LLVM version 6.0 (clang-600.0.56) on x86_64
* allow to define more atoms with MAX_ATOM env var on 64 bits machines
* fix a bug in bagof/3 when used as findall/3
* port to sparc64/OpenBSD
  (machine kindly provided by Duncan Patton a Campbell)
* add built-in predicate findall/4
* fix a bug with linedit when environment variable LINEDIT=no
* fix bugs in the FD solver
* set socket option SO_REUSEADDR at socket creation
* support for alternate Prolog file extension .prolog
* fix a bug in atoms for 1-char atom '\0' (now acts as the empty atom)
* fix problems with Apple/Mavericks gcc = LLVM version 5.0 (clang-500.2.79) on x86_64
* remove clang warnings (uninitialized variables)
* fix bugs in the lexer of the form 0bop 2 when bop is an infix op
* fix terminal ANSI sequence handling in linedit
* increase internal compiler data sizes
* fix bug in gprolog.h (invalid 64 bits PL_MAX_INTEGER)

Change in GNU Prolog version 1.4.4 (Apr 2013):

* add Prolog flags c_cc_version_data
* fix a regression bug in linedit
* fix a little bug in the debugger
* add subtract/3 built-in predicate

Change in GNU Prolog version 1.4.3 (Mar 2013):

* add new C foreign interface functions converting term to/from C strings
* modify top-level banner to show 32/64 bits, compile date, C compiler name
* modify Linedit: fix Prolog prompt when Linedit is not activated
* modify linedit: accept gui=silent in env var LINEDIT
  (does not warn if the windows gui DLL is not found)
* fixes for Windows 8 (i686 and x86_64) with MSVS 2012, mingw64 gcc > 4.5.3
* add Prolog flags address_bits, compiled_at, c_cc, c_cflags, c_ldflags
* fix a bug in the FD solver (option backtracks in fd_labeling)
* improve the FD solver (better propagation for reified constraints at labeling)
* improve the FD solver (add labeling option: value_method(bisect))
* improve the FD solver (avoid some cases of C stack overflow, improved fd_domain/3)
* fix another bug in the FD solver (regression bug in 1.4.2)
* add PlULong to gprolog.h and PlThrow(ball) to C foreign interface
* fix a bug in the FD solver (regression bug in 1.4.2)

Change in GNU Prolog version 1.4.2 (Dec 2012):

* fix a bug in the compiler for byte-code with op/3 directive
* fix a bug in the debugger
* modify decompose_file_name/4 (fix problems under windows)
* add built-in is_absolute_file_name/1 and is_relative_file_name/1
* modify the compiler include/1 directive handling
  (if the file to include is not found, search in directories of parent includers)
* modify atom table management (its size can be defined via env. var MAX_ATOM)
* fix a bug with soft-call inside a meta-call
* implement term_hash/2 and term_hash/4. Backward incompatibility:
  new_atom/3 and and atom_hash/2 no longer exists.
* fix some little bugs with 64 bits (e.g. stream id)
* modify the FD solver to handle very long computations
* fix a bug in the compiler (unification with fresh vars in the body)
* fix a bug with *-> containing ! in the test part (! was not local to the test)
* fix a bug to configure with sigaction on old Linux kernels
* fix some problems/bugs on 64 bits machine

Change in GNU Prolog version 1.4.1 (Jun 2012):

* improve signal handling
* add an option --wam-comment to gplc and pl2wam
* fix multifile directive (works now with an empty predicate as required by ISO)
* fix absolute_file_name to expand ~ using HOMEDRIVE and HOMEPATH under windows
  if HOME is not defined
* improve listing/0-1 output
* add soft cut control construct and its associated operator *->
* improve the top-level results in case of cyclic terms
* fix arithmetic evaluable functor ^/2 to work with floats
* increase maximum number of variables in a term
* add write_term option variable_names
* add built-in predicates between/3 and succ/2
* fix bug in the DCG expander
* fix bug in member/2
* recognize escape sequence \s (space) and \e (escape) if strict_iso is off
* add error detection in length/2 if given length is negative
* add built-in predicates maplist/2-9
* fix a regression bug in the FD solver about sparse domains
* increase size of FD internal stacks and fix memory leak
* port to x86_64/Darwin (Mac OS X) - many thanks to
  Ozaki Kiichi <gclient.gaap@gmail.com>
* fix a bug in x86_64 with --disable-regs
* fix a bug when consulting a file under Win XP/Vista 32 bits
* fix a bug when consulting a file using '$VAR'(N) or '$VARNAME'(A)
* fix a bug in new_atom/1-2 which returned duplicates
* fix a bug in write/1 when an empty atom is passed
* improve portray_clause (numbervars and space before final dot)

Change in GNU Prolog version 1.4.0 (Jul 2011):

* GNU Prolog is now licensed under a dual license LGPL or GPL
* port to x86_64/MinGW64 - many thanks to
  Jasper Taylor <jasper@simulistics.com> (see src/WINDOWS64)
* port to x86_64/MSVC (see src/WINDOWS64)
* add a configure option to control Windows HtmlHelp
  --disable-htmlhelp or --enable-htmlhelp[=static/dynamic]
* improve a lot (and fix some bugs in) the Windows GUI Console
* change location of gprologvars.bat under Windows (in install directory)
* increase default stack sizes (32Mb for heap, 16Mb for others)
* change the default setting for flag strict_iso: it is on now
* add control constructs to the predicate table
* modify predicate_property/2 (built_in_fd ==> built_in, add control_construct)
  only accepts a Head (a callable) (no longer a predicate indicator)
* fix a bug in the compiler (bad unification with singleton variable)
* fix a bug with strict_iso flag (was not passed to consult)
* add shebang support using #!/usr/bin/gprolog --consult-file
* modify the mangling scheme for future module support (see hexgplc)
* fix write_term default options (now numbervars(false) and namevars(false))
* fix read/1: tab and newlines are not accepted inside single/back/double quoted tokens
* add additional errors to compare/3 and keysort/2
* accept space under the top-level (same as ;)
* modify portray_clause/1-2 to add a newline at the end of the output
* add acyclic_term/1 (compatibility only since GNU Prolog does not handle cyclic terms)
* fix write/1 to treat '$VARNAME'(Atom) as a var name only if Atom is a valid var name
* rename evaluable functor atan/2 as atan2/2 and >< as xor
* add evaluable functor div/2
* detect op/3 error cases for | [] {}
* replace type_error(variable, X) by uninstantiation_error(X) (e.g. open/3-4)
* add built-in term_variables/2-3 and subsumes_term/2
* add some type tests on chars and codes (in number_chars/2, number_codes/2,..)
* fix some little bugs in the parser
* add meta_predicate property to predicate_property/2
* fix a memory leak in atom_concat/3 (in case of failure)
* add infix operator '|' (and allow it to be unquoted in read/write)
* improve top-level variables display adding () when needed
* fix a bug in length/2 (length(L,L) now loops)
* support the ISO multifile/1 directive
* add built-ins false/0 and forall/2
* detect an instantiation_error in phrase/2-3
* GNU Prolog is now licensed under LGPL
* allow rounding functions to accept an integer if strict_iso is off
* group all examples under a new directory 'examples'
* fix a bug in read_from_codes/2 and number_codes/2
* improve speed of built-in predicates on list (append, member, reverse,...).
* improve CTRL+C handling under the top-level
* add is_list/1 (same as list/1)
* add Prolog flags: dialect, home, host_os, host_vendor, host_cpu,
  host, arch, version, version_data, unix, argv
* add preprocessor directives if/1 else/0 elif/1 endif/0
* fix a bug on large ints in the byte-code for 64-bits machine
* fix a bug with call/2-N
* change listing/0-1 printing stream: now it is current_output
* add a new stream alias: user_error associated to stderr
* add evaluable functors: (a)sinh/1, (a)cosh/1, (a)tanh/1
* add evaluable functors: epsilon/0, lsb/1, msb/1, popcount/1
* fix compilation problem under Mac OS X Snow Leopard (force 32-bits mode)
* add evaluable functors: log/2, gcd/2, tan/1, atan2/2, pi/0, e/0
* add built-in ground/1
* rename built-in sort0 as msort
* add new error detection for keysort
* accept (but ignore) directive encoding/1
* add xor/2 operator (bitwise XOR) ^/2 becomes integer exponentiation
* improve randomize/0 (more different values on consecutive calls)
* relax the lexer to also accept 0'' (ISO requires 0''' or 0'\') if strict_iso is off
* fix a bug with top-level options --entry-goal and --query-goal

Change in GNU Prolog version 1.3.1 (Feb 2009):

* add working sigaction detection to detect fault addr (e.g. Mac OS X)
* add gplc option --no-mult-warn
* add prolog flags suspicious_warning, multifile_warning
* detect integer underflow/overflow in the parser
* fix a memory leak in catch/3
* increase limits (MAX_VAR_NAME_LENGTH=1024 and MAX_VAR_IN_TERM=10240)
* add PL_INT_LOWEST_VALUE and PL_INT_GREATEST_VALUE to gprolog.h
* prefix all global symbols, constants and types with Pl_ PL_ Pl
* fix a bug in the byte-code due to new max number of atoms
* provide a minimal gprolog.h
* detect if struct sigcontext needs asm/sigcontext.h on Linux
* modify gplc: --c-compiler also sets linker and --linker added
* port to x86_64/BSD - many thanks to
  David Holland <dholland@netbsd.org>
* fix problem using ebx as global reg (bug in gcc 4.3.2)
* fix a bug in is/2 with [X] (X should only be an integer)
* fix a bug with atoms '/*' '*/' and '%' (were not quoted)
* increase maximum number of atoms to 1048576 (2^20)
* increase default stack sizes (16Mb for heap, 8Mb for others)
* fix stack alignment for x86_64/Solaris
* include patch from Paul Eggert <eggert@cs.ucla.edu> for sparc/solaris8
* port to x86_64/Solaris - many thanks to
  Scott L. Burson <Scott@coral8.com>
* fix a bug in the FD solver (under 64 bits machines)
* fix a bug in arithmetics (mod)

Change in GNU Prolog version 1.3.0 (Jan 2007):

* change error messages emitted by the compiler to follow GNU standards
* modify doc (mainly rename manual.xxx to gprolog.xxx)
* add DESTDIR variable support in main Makefile for staged installs
* fix a bug with Prolog floats in x86_64/Linux (bad stack alignment)
* port for ix86/Darwin (Mac OS X)
* add check target to main Makefile
* improve Win32 ports (Cygwin, MinGW, MSVC 6.0 and 2005 Express Edition)
  (MSVC port uses MinGW as.exe instead of nasm.exe - named mingw-as.exe
   provided in the setup.exe)
* rename call/2 to call_det/2
* implement call/2-11 as will be defined in the next standard
* fix various problems when compiling with gcc 4 (gcc 4.1.1)
* emit .note.GNU-stack to mark the stack as no executable
  in x86_any.c, x86_64_any.c and powerpc_any.c
* change the way objects are found (obj_chain.c) using gcc ctors
* use Doug Lea malloc for OpenBSD (problem with malloc using mmap)
* fix problems in various ports:
  alpha/Linux, powerpc/Darwin (Mac OS X), sparc/solaris, ix86/OpenBSD

Change in GNU Prolog version 1.2.19 (Jun 2005):

* fix 2 bugs in global variables

Change in GNU Prolog version 1.2.18 (Jun 2004):

* fix problem when compiling with gcc 3.4.0
* fix bug in term comparison involving negative integers
* add consult, ... and fix minor bugs in the Win32 GUI console menu
* fix the stack overflow detection under Cygwin
* port to ix86/MinGW - many thanks to
  Cesar Rabak <csrabak@ig.com.br>
* fix a bug in the port to sparc/solaris
* fix a problem in the port to x86/OpenBSD
* port to sparc/NetBSD and powerpc/NetBSD - many thanks to
  Jason Beegan <jtb@netbsd.org>
* fix a bug in =../2 involving FD variables
* fix a bug in arithmetics (in float_{integer/fractional}_part)
* fix a bug in FD solver (wrong union with a singleton)
* fix a bug with the foreign C interface

Change in GNU Prolog version 1.2.17 (Feb 2003):

* change configure.in: by default ebp is not used
* fix a but with CTRL+C handler not reinstalled
* fix a bug with _XXX (re)displayed under the top-level
* port to x86_64/Linux - many thanks to
  Gwenole Beauchesne <gbeauchesne@mandrakesoft.com>

Change in GNU Prolog version 1.2.16 (Sep 2002):

* fix bug in predicate_property/2
* add new built-in fork_prolog/1 and create_pipe/2
* fix a bug in atom_concat/3
* fix bug when detecting if a stream can be repositioned

Change in GNU Prolog version 1.2.15 (Sep 2002):

* fix bug in output to constant terms (e.g. write_to_atom/2)
* include another additional patch for sockets under win32 - due to
  Brent Fulgham <brent.fulgham@xpsystems.com>
* fix bug in bagof/3 with FD variables
* fix bug with randomize/0

Change in GNU Prolog version 1.2.14 (Jun 2002):

* added min/max to Prolog arithmetics
* fix bugs in current_predicate and predicate_property

Change in GNU Prolog version 1.2.13 (Jun 2002):

* port to powerpc/Darwin (Mac OS X) - many thanks to
  Lindsey Spratt <spratt@alum.mit.edu>
* fix bug in Win32 GUI console (deal with edit control text limit)
* fix bug with in-place installation procedure
* fix problem with portray_clause/2 using $VARNAME and $VAR
  now portray_clause((p(Z):-p('$VARNAME'('A'),Z))) is OK
* fix bug with stream buffering (open/4 and set_stream_buffering/2)
* add stream mirror facility (see add_stream_mirror/2)

Change in GNU Prolog version 1.2.12 (Apr 2002):

* improve global vars (arg. selector, automatic array, new built-ins)
* fix two bugs with Ctrl+C reentrancy under the top-level
* added priority/1 option to write_term to specify starting priority
* now under the top-level, _XXX variables are not displayed
* fix bug in decompose_file_name/4 (tried to modify read-only string)
* now open/4 better detects if a stream can be repositioned
* add source reader facility (built-in) - not yet documented
* fix current_predicate bug, now current_predicate(nl/0) fails
* fix linedit bug in tab pasting and add Esc-Tab function
* now linedit goes to EOL at CR to fix bug with multi-line inputs
* now linedit avoids to put in history 2 same consecutive lines
* remove max_stream limitation (the Prolog flag no longer exists)
* the template of get_print_stream/1 is now ?stream
* patch to allow more than 64Mb for the stacks under ix86/Linux
* fix a bug in wam2ma (hexa name creation overflowed malloc buffer)

Change in GNU Prolog version 1.2.11 (Mar 2002):

* fix a problem under sparc/solaris using mmap (adding MAP_FIXED)
* fix a problem with gcc 3.0.x which always uses ebp in main()
* use -march=xxx gcc option instead of -mxxx for ix86

Change in GNU Prolog version 1.2.10 (Jan 2002):

* gplc now passes -L option to ld in the order of apparition
* gplc accepts meta-characters %p, %d,... in output file names
* include additional patch for sockets under win32 - due to
  Brent Fulgham <brent.fulgham@xpsystems.com>

Change in GNU Prolog version 1.2.9 (Dec 2001):

* re-write Windows GUI Console in pure Win32 (no more MFC)
* adapt configure.in to work with autoconf 2.52
* add Prolog flag back_quotes and values {atom,chars,codes}_no_escape
* use a terminal recursion in FD arithmetic normalization
* fix bug in bind_variables/2, reported by:
  Bowie Owens <owe043@phi-cq.vic.cmis.csiro.au>
* modify Ma2Asm mappers to use Y_OFFSET (from ENVIR_STATIC_SIZE)
* fix some bugs in the Wam debugger
* add several options to the top-level to execute goals
* add an environment variable LINEDIT to control linedit options
* fix bug in linedit on \b in start of line (using ANSI ESC sequences)
* simplify linedit: only apply to stdin
* now linedit is reentrant
* now linedit works with XFree keyboard encoding
* rename built-in get_code_no_echo/1-2 by get_key_no_echo/1-2
* add built-in get_key/1-2
* use get_key/1-2 in the top_level + debugger (thus with echo)
* improve the top-level Ctrl+C manager
* fix bug on Linux configured with --disable-regs
* add pipe to pl2wam stdin when called by consult/1
* fix bug in FD: forall is now recognized in .fd files
* fix bug in DCG: expand_term((a --> X), Y) is OK
* fix X paste problem in linedit
* simplify top_comp.c to better control include dirs in devel. mode
* specialized functions for create/update/delete choice points
* fix a bug in wam2ma (hexa name creation overflowed malloc buffer)
* include patch to support basic sockets under win32 - due to
  Brent Fulgham <brent.fulgham@xpsystems.com>
* arithmetic functions and inlined built-ins use fast call
* specialized functions for switch_on_term_xxx
* modify pl2wam to generalize '$call_c' (add options)

Change in GNU Prolog version 1.2.8 (Oct 2001):

* fix bug - delete file created by mkstemp(2), patch from:
  Salvador Abreu <spa@debian.org>
* space_args(true) now displays a space inside {}/1
* space_args(true) now displays a space after a comma (','/2)

Change in GNU Prolog version 1.2.7 (Sep 2001):

* add a --foreign-only option to pl2wam
* foreign/2 directives are ignored in byte-code mode (no fatal error)
* space_args(true) now displays space between operators and arguments
* add CVS Id to prolog files
* fix bug in pl2wam to include break/0, trace/0,... in bip_list.pl
* get rid of mktemp and tempnam calls (use mkstemp if available)
* fix a bug in fd_element_var/3 constraint
* fix bug in fd headers (fd_to_c.h not installed)
* fix a bug with unify_with_occurs_check/2
* fix bug on ix86 using ebp (add -fomit-frame-pointer in CFLAGS_MACHINE)

Change in GNU Prolog version 1.2.6 (Jan 2001):

* fix a bug with ! in dynamic code
* fix a bug in arithmetics

Change in GNU Prolog version 1.2.5 (Dec 2000):

* big modification (1 month) to optimize the execution speed

Change in GNU Prolog version 1.2.4 (Nov 2000):

* implement fast call (mainly for WAM functions)
* modify C->Prolog foreign interface to recover arguments space
* improve dynamic clause management and fix a bug (memory leak)
* fix _ symbol prefix problem for Free BSD
* no longer use dl_malloc on Linux but prevent MMAP using mallopt

Change in GNU Prolog version 1.2.3 (Sep 2000):

* full re-indentation of the sources for CVS
* added acos/asin to Prolog arithmetics

Change in GNU Prolog version 1.2.2 (Sep 2000):

* port to alpha/Linux - many thanks to
  Alexander Diemand <ax@apax.net>
* port to alpha/OSF1
* port to mips/irix - many thanks to
  Alexander Diemand <ax@apax.net>
* fix a bug in stty.c (use standard termios if present)

Change in GNU Prolog version 1.2.1 (Jul 2000):

* fix a bug in stty.c (use termio by default and else termios)

Change in GNU Prolog version 1.2.0 (Jul 2000):

* more customizable configuration/installation procedure

Change in GNU Prolog version 1.1.7 (Jul 2000):

* port for ix86/NetBSD - many thanks to
  Brook Milligan <brook@nmsu.edu>

Change in GNU Prolog version 1.1.6 (Jun 2000):

* rename configuration file config.h by gp_config.h
* avoid to establish a connection at start to get the hostname
* fix a bug in the compiler about \\ inside quoted atoms
* fix a bug in dynamic clause retraction (memory leak)
* fix a bug in atom management (existing atoms eat mallocated space)
* added creation/1 and last_access/1 property to file_property/2
* start of native Win32 port

Change in GNU Prolog version 1.1.5 (Mar 2000):

* port for ix86/FreeBSD - many thanks to
  Nicolas Ollinger <nollinge@ens-lyon.fr>

Change in GNU Prolog version 1.1.4 (Jan 2000):

* fix a bug in the byte-code loader (bad realloc computation)
* fix a bug in the malloc (used MMAP under Linux)

Change in GNU Prolog version 1.1.3 (Dec 1999):

* port for ix86/SCO - many thanks to
  Clive Cox <clive@laluna.demon.co.uk> and
  Edmund Grimley Evans <edmundo@rano.demon.co.uk>
* port for ix86/solaris - many thanks to
  Andreas Stolcke <stolcke@speech.sri.com>
* fix a bug in the FD solver for X#\=C (if C is max(X))
* fix a bug with directory_files/2 (too many open files)

Change in GNU Prolog version 1.1.2 (Nov 1999):

* fix a bug in the compiler about \t in quoted atoms
* fix a bug in the scanner about 0'<character>

Change in GNU Prolog version 1.1.1 (Oct 1999):

* fix bug with popen/3
* update machine.c for struct sigcontext under Linux

Change in GNU Prolog version 1.1.0 (Oct 1999):

* fix a bug in the output of some extended characters in native-compilation

Change in GNU Prolog version 1.0.6 (Sep 1999):

* implementation of call_with_args
* fix a bug in sign/1 for arithmetic evaluation

Change in GNU Prolog version 1.0.5 (Jul 1999):

* fix a bug in foreign C calling Prolog on sparc

Change in GNU Prolog version 1.0.4 (Jul 1999):

* fix a bug in sparc compilation
* fix a bug in foreign code under sparc
* update pl_config.c to show which version is installed

Change in GNU Prolog version 1.0.3 (Jun 1999):

* add linedit test to avoid to re-echo an already buffered full-line
* fix bugs is sort/1
* fix bug in sleep/1 (incorrect behavior with a float)
* finish preliminary port to Cygwin (see file src/PROBLEMS)
* fix bug in FD solver (too much trail allocated due to bad vec_size)
* fix labeling first-fail to correspond to clp(FD)
* fix message from consult when pl2wam cannot be found

Change in GNU Prolog version 1.0.2 (Jun 1999):

* fix precision bug on floating constants

Change in GNU Prolog version 1.0.1 (Jun 1999):

* initial port for ix86/Cygwin (Win32) (to finish)
* fix bug in throw_c.c (foreign code catch exception)
* improve Ma2Asm check.c and FromC/ utilities
* port for PowerPC / GNU/Linux  (see file src/PROBLEMS)
* fix bug using egcs-1.1.2 (RedHat 6.0) (add a Stop_Prolog() fct)
* removed Configure directory (clashes with ./configure under WinXX)
* fix Linedit/Makefile.in (CFLAGS added)
* add ensure_linked directive
* fix bug in gplc help (-C/-A/-L instead of --C/--A/--L)
* fix bug in gplc (with too long command-lines)
* fix bug in M_Absolute_Path_Name() (/.automount gave /automount)
* work release 1.0.1
* fix bug --disable-regs works now for solaris
* optimize FD equations (math_supp.c) avoid qsort sometimes
* fix bug in installation procedure (Html doc installation)

Change in GNU Prolog version 1.0.0 (Apr 1999):

* rewrite in C DCG translation:
  optimize unifications, no more ill-balanced conjunctions
* fix bug in bc_supp.c to avoid aux pred name for unknown predicate
* fix bug in pl2wam (:- set_prolog_flag(singleton_warning,off))
* current_prolog/1 conforms to ISO thanks to strict_iso flag
* fix bug (type_list instead of instantiation error for Options)
* fix bug setof (not sorted when comes down to findall)

Change in GNU Prolog version 0.9.0 (Mar 1999):

* add Prolog flag strict_iso (to relax predicate indicators)
* fix number_chars and friends non ISO conforming behavior
* modify wam2ma to avoid static arrays (use dynamic allocation)
* add in-place installation (modify configure.in and Makefile.in)
* add copyright headers in source files
* rewrite all solutions built-in predicates (in C)
* add in-place sorts
* rewrite DCG translations
* fix compiler bug in wam2ma (atom using \xHH\ not correctly handled)
* rewrite sorts built-in predicates (in C)
* Calypso (beta 7) becomes GNU Prolog 0.9.0
  change command names (calypso -> gprolog, plcc -> gplc,...)
  copyright messages (--version),...

Change in Calypso version 1.0-beta7 (Mar 1999):

* fail/0 caused an existence_error under the debugger
* user/built_in/built_in_fd not recognized by load/1
* Calypso version 1.0-beta7 ready for internal use
