+
+Changes from 0.8.5 to 0.9.0:
+
+ * The QUICK CLUSTER command has a /PRINT subcommand which shows
+ the initial cluster centres and the final cluster membership of
+ each case. The clustering algorithm has also been updated, so
+ as to produce better separated clusters.
+
+ * A Russian localisation has been contributed.
+
+ * The GRAPH command now has a /BAR subcommand to draw barcharts.
+
+ * The graphical user interface (psppire) has been changed as follows:
+
+ - It now uses Gtk+ version 3 instead of version 2. Accordingly, it has a
+ somewhat different look and feel.
+
+ - There is now a Graphs menu to access the GRAPH command.
+
+ - The status of dialog box widgets are now preserved between calls
+ to the same dialog box for the same dataset.
+
+ * The pspp-convert utility can now decrypt encrypted syntax files.
+ The encrypted syntax file format is unacceptably insecure, so to
+ discourage its use PSPP and PSPPIRE do not directly read or write
+ this format.
+
+ * Bug fixes, including the following notable ones:
+
+ - The correlation coefficient in the paired samples t-test
+ procedure is now correctly calculated when presented with
+ weighted data.
+
+ - The ESCAPE subcommand has been removed from GET DATA /TYPE=TXT.
+ For compatibility, the behavior that ESCAPE enabled is now the
+ default and only supported behavior.
+
+ - Rendering of the variable and data sheets in right-to-left locales
+ now works properly.
+
+Changes from 0.8.4 to 0.8.5:
+
+ * The FREQUENCIES and CROSSTABS commands can now generate barcharts.
+
+ * The FACTOR command can now perform PROMAX rotations.
+
+ * SPSS/PC+ system files are now supported on GET and other commands
+ that read SPSS system files. The pspp-convert program can now read
+ SPSS/PC+ system files. Writing the obsolete SPSS/PC+ system file
+ format is not supported.
+
+ * SYSFILE INFO can now read SPSS/PC+ system files and SPSS portable
+ files.
+
+ * FREQUENCIES: A bug was fixed where an assertion failure occured
+ when an empty dataset was presented.
+
+ * The GRAPH command is now available. Initially it supports
+ scatterplots and histograms.
+
+ * The RND operator in expressions now supports additional operands
+ for rounding to values other than integers and to indicate a level
+ of rounding fuzz. The default rounding fuzz may now be controlled
+ and displayed with SET FUZZBITS and SHOW FUZZBITS, respectively.
+
+Changes from 0.8.3 to 0.8.4:
+
+ * Formatting of SYSFILE INFO output was made easier to read.
+
+ * Bug fixes, including the following notable ones:
+
+ - FREQUENCIES works properly for string variables. (This bug was
+ introduced in 0.8.2.)
+
+ - CROSSTABS now correctly computes all of the measures that it
+ offers. Some measures have been removed because they were not
+ computed correctly.
+
+ - The NPAR TESTS calculation of significance for the RUNS
+ subcommand has been corrected.
+
+ - Planned comparisons in ONEWAY ANOVA now correctly handle negative
+ T-values.
+
+ - The COUNT command now correctly treats missing values as
+ documented.
+
+ - Conformance fixes to Open Document output format.
+
+Changes from 0.8.2 to 0.8.3:
+
+ * Independent T-Tests displayed the standard error of the difference
+ and the confidence interval for the unequal variances case, where
+ the equal variances case should have been. This has been fixed.
+
+ * REGRESSION now recognises /STATISTICS=CI(x) which causes confidence
+ intervals for the coefficients to be printed.
+
+ * When DESCRIPTIVES calculates Z scores, it now omits cases filtered
+ by the current FILTER settings.
+
+ * PSPPIRE graphical user interface improvements:
+
+ - Dialog boxes with source variable lists can now choose the sort
+ order; right click and select from the popup menu.
+
+ - File|Open now allows an encoding to be selected for opening
+ system files.
+
+ - File|Display Data File Information|External File... now allows an
+ encoding to be selected.
+
+ - A problem with the Means dialog has been resolved (bug #41433).
+
+ - Several problems related to the input of spreadsheets have been
+ fixed (bug #41657, #41620
+
+ * System file related improvements:
+
+ - With ENCODING="DETECT", SYSFILE INFO can now help the user to
+ pick an encoding for reading a system file that does not identify
+ its own encoding
+
+ - SYSFILE INFO now accepts an ENCODING subcommand to specify the
+ character encoding of string data in the system file.
+
+ - Variable labels over 255 bytes long are now accepted without
+ truncation (bug #41863).
+
+ - System files that contain duplicate variable names may now be
+ read successfully (bug #41475).
+
+Changes from 0.8.1 to 0.8.2:
+
+ * Charts are now rendered with colours from the Tango palette instead
+ of fully saturated primaries.
+
+ * Support for new system file variants:
+
+ - PSPP can now read and write ZCOMPRESSED system files, which
+ compress data much more effectively than older "compressed"
+ files. (The older format is still supported.)
+
+ - PSPP can now decrypt encrypted system files, using the new
+ pspp-convert utility. The encrypted system file format is
+ unacceptably insecure, so to discourage its use PSPP and PSPPIRE
+ do not directly read or write this format.
+
+ * Missing values for long string variables are now read from and
+ written to system files in an SPSS-compatible fashion.
+
+ (Earlier versions of PSPP that supported missing values for long
+ string variables wrote them to system files in an SPSS-incompatible
+ way. To fix the problem, read the system file with this version of
+ PSPP and then save a new copy of it.)
+
+ * pspp-convert, a new standalone utility for converting SPSS system
+ and portable files to other formats, is now included. The initial
+ version supports comma-separated value files as output format.
+ pspp-convert can also decrypt encrypted system files.
+
+ * Build changes:
+
+ - zlib is now a required dependency. (Previously it was optional.)
+
+Changes from 0.8.0 to 0.8.1:
+
+ * New commands:
+
+ - VARIABLE ROLE.
+
+ * Changes to existing commands:
+
+ - CROSSTABS: The requirement that one expected count must be less than five
+ before Fishers Exact Test will be reported has been removed.
+
+ * PSPPIRE graphical user interface improvements:
+
+ - A new set of icons has been contributed.
+
+ - Syntax windows now parse syntax in "auto" mode, which in practice
+ should mean that both "batch" and "interactive" syntax now works,
+ instead of just "interactive" syntax.
+
+ - The variable pane of data windows now include a Role column.
+
+ * Notable bug fixes:
+
+ - System files written by IBM SPSS 21 are now read without warnings.
+
+ - System files written by "VOXCO INTERVIEWER 4.3" are now read
+ without warnings.
+
+ - PSPPIRE should now more gracefully handle syntax files that contain
+ errors.
+
+Changes from 0.6.2 to 0.8.0:
+
+ * New commands:
+
+ - ADD FILES
+ - CORRELATIONS
+ - DATAFILE ATTRIBUTES
+ - DATASET ACTIVATE
+ - DATASET CLOSE
+ - DATASET COPY
+ - DATASET DECLARE
+ - DATASET DISPLAY
+ - DATASET NAME
+ - LOGISTIC REGRESSION
+ - MATCH FILES
+ - MEANS
+ - MRSETS
+ - PRESERVE and RESTORE
+ - QUICK CLUSTER
+ - RELIABILITY
+ - ROC
+ - SAVE TRANSLATE to CSV and tab-delimited files
+ - UPDATE
+ - VARIABLE ATTRIBUTES
+
+ * Changes to existing commands:
+
+ - AUTORECODE has a new GROUP subcommand.
+
+ - CROSSTABS has been re-implemented to fix numerous bugs.
+
+ - EXAMINE: /MISSING=LISTWISE is now the default.
+
+ - DO REPEAT command has been reimplemented. Now, when DO REPEAT
+ contains an INCLUDE or INSERT command, substitutions are not
+ applied to the included file.
+
+ - FILE HANDLE has a new ENDS subcommand to select CR or CRLF new-lines.
+
+ - HOST has been updated to use more modern syntax.
+
+ - Most commands that work with data files now support a new
+ ENCODING subcommand.
+
+ - MISSING VALUES can now assign missing values to long string
+ variables.
+
+ - ONEWAY: the POSTHOC subcommand is now implemented.
+
+ - The following new subcommands to NPAR TESTS have been implemented:
+ COCHRAN, FRIEDMAN, JONCKHEERE-TERPSTRA, KENDALL, KRUSKAL-WALLIS, MANN-WHITNEY,
+ MCNEMAR, SIGN, WILCOXON, and RUNS
+
+ - SET and SHOW no longer have ENDCMD, NULLINE, PROMPT, CPROMPT, and
+ DPROMPT subcommands. The defaults are now fixed values.
+
+ - SHOW now has a JOURNAL subcommand, to show the location of the
+ journal file.
+
+ - VALUE LABELS can now assign value labels to long string
+ variables.
+
+ * Other language changes:
+
+ - The new DATASET commands replace the "scratch file" PSPP
+ extension, which is no longer supported.
+
+ - Strings may now include arbitrary Unicode code points specified
+ in hexadecimal, using the syntax U'hhhh'. For example, Unicode
+ code point U+1D11E, the musical G clef character, may be
+ expressed as U'1D11E'.
+
+ See the "Tokens" section in the PSPP manual for more information.
+
+ - In previous versions of PSPP, in a string expressed in
+ hexadecimal with X'hh' syntax, the hexadecimal digits expressed
+ bytes in the locale encoding. In this version of PSPP, X'hh'
+ syntax always expresses bytes in UTF-8 encoding.
+
+ See the "Tokens" section in the PSPP manual for more information.
+
+ * PSPPIRE graphical user interface improvements:
+
+ - Added support for non-ASCII characters in strings, labels and
+ variable names.
+
+ - A "Split Window" function is available, which makes it easier to
+ see different parts of a large data file.
+
+ - Data files can now be opened by specifing their name as the first
+ argument. This means that on a properly configured desktop, double
+ clicking on an icon will open the file.
+
+ - Foreign formats, such as Gnumeric, OpenDocument and CSV can be imported
+ via using an "intelligent" application assistant dialog.
+
+ * Output changes:
+
+ - The new "cairo" output driver supports output in PostScript, PDF,
+ and SVG formats. Its functionality is a superset of that of the
+ "postscript" driver, which has been removed. You must have Cairo
+ and Pango installed to build the "cairo" driver.
+
+ - Charts are now produced with Cairo and Pango, instead of libplot.
+ Without them, the new graphing features will not work. If you do
+ not have Cairo and Pango installed, you must run `configure' with
+ --without-cairo.
+
+ - The plain text output driver now properly supports multibyte UTF-8
+ characters, including double-width characters and combining
+ accents.
+
+ - Output to OpenDocument format is now supported.
+
+ - The HTML output is much improved.
+
+ * The "pspp" program has a new option --batch (or -b) that selects
+ "batch" syntax mode. In previous versions of PSPP this syntax mode
+ was the default. Now a new "auto" syntax mode is the default. In
+ "auto" mode, PSPP interprets most syntax files correctly regardless
+ of their intended syntax mode.
+
+ See the "Syntax Variants" section in the PSPP manual for more
+ information.
+
+ * The "pspp" program has a new option --syntax-encoding that
+ specifies the encoding for syntax files listed on the command line,
+ as well as the default encoding for syntax files included with
+ INCLUDE or INSERT. The default is to accept the system locale
+ encoding, UTF-8, UTF-16, or UTF-32, automatically detecting which
+ one the system file uses.
+
+ See the documentation for the INSERT command in the PSPP manual for
+ more information.
+
+ * Text data files that PRINT and WRITE creates now use the system
+ native line ends by default (CRLF on Windows, LF only elsewhere).
+ Use the new ENDS subcommand on FILE HANDLE to override the default.
+
+ * A new Perl module allows Perl programs to read and write PSPP
+ system files.
+
+ * A tutorial chapter has been added to the user manual.
+\f
+Changes from 0.6.1 to 0.6.2:
+
+ * New translations:
+
+ - Dutch, thanks to Harry Thijssen.
+
+ - Brazilian Portuguese, thanks to Michel Boaventura.
+
+ Thanks for translations are also due to the coordinators at
+ translationproject.org.
+
+ * Statistical bug fixes:
+
+ - REGRESSION: Report correct standard error of the estimate (bug
+ #25677).
+
+ - T-TEST: Report correct significance of paired sample T-test in
+ the common case (bug #26936) and corner cases. Thanks to Mike
+ Griffiths and Matej Cepl for reporting these bugs.
+
+ * Build fixes and changes:
+
+ - Fix build with GTK+ 2.17.4 and later.
+
+ - Make running "make" after running "configure" with different
+ settings reliably rebuild version.c.
+
+ - Cygwin and MinGW build fixes.
+
+ - Fixes for building with recent gnulib.
+
+ - The Makefile now honors two new variables, PSPP_LDFLAGS and
+ PSPPIRE_LDFLAGS, that affect linking of the PSPP and PSPPIRE
+ binaries, respectively. This makes building easier for some
+ packagers.
+
+ - Fixes for "configure --enable-relocatable" (bug #25508).
+
+ * Data file bug fixes and changes:
+
+ - Fix reading text data files that contain a mix of white space
+ and commas. Now "a ,b" is treated as two fields containing "a"
+ and "b"; previously it was treated as three, with an empty field
+ in the middle.
+
+ - Fix writing corrupted .sav files on Windows.
+
+ - Fix writing variable labels longer than 252 bytes to save files.
+ Thanks to Robert Westlund for reporting this bug.
+
+ - Fix writing corrupted .por files (bug #26034).
+
+ - Fix reading .por files whose initial lines are not padded out
+ with spaces as expected.
+
+ - PSPP will no longer issue warnings about some .sav file records
+ or values that it does not understand. These warnings were
+ harmless, but needlessly alarmed some users.
+
+ - Fix crash reading empty string fields from PostgreSQL databases.
+
+ * Bug fixes that affect PSPP and PSPPIRE:
+
+ - Users may now control precision of output statistics. Instead
+ of hard coding the width and decimals of output numbers, respect
+ the default format in most instances. Counts are now normally
+ displayed with the format of the weight variable, if any.
+
+ - Fix crash when an INSERT command specifies the name of a file
+ that does not exist (bug #24569).
+
+ - Fix crash when CROSSTABS specifies a long-string variable (bugs
+ #24557 and #26131).
+
+ - Fix crash drawing pie charts with many segments.
+
+ - Fix crash when NUMERIC specifies an invalid format.
+
+ * PSPPIRE bug fixes and changes:
+
+ - On Windows, write the output file to the user's home directory
+ instead of the current directory, to better match user
+ expectations.
+
+ - Some data editor fixes.
+
+ * Documentation:
+
+ - Fix typo in BINOMIAL section of user manual (bug #25892).
+
+Changes from 0.6.0 to 0.6.1:
+
+ * Statistical bug fixes:
+
+ - Report correct standardized regression coefficients in linear
+ regression output (bug #23567).
+
+ * Bug fixes that affect PSPP and PSPPIRE:
+
+ - Avoid crash with pie charts (bug #24014).
+
+ - Don't append % to count totals (bug #24003).
+
+ - Don't crash on bad input (bug #24031).
+
+ - Don't crash if "end data." is not left aligned (bug #24115).
+
+ - Change default workspace value to 64 MB, to avoid unnecessary
+ disk accesses on modern machines.
+
+ * PSPPIRE bug fixes:
+
+ - Add ".sav" or ".por" suffix to filename when saving with Save_As
+ (bug #23137).
+
+ - Make it possible to reopen the output window on Windows (bug
+ #24033).
+
+ - A POSIX regular expression library is now included and used
+ automatically if the host does not have one or has one that is
+ inadequate.
+
+ * Build fixes and changes:
+
+ - Work around bug in GSL that prevented build with recent GCC
+ versions without manually adding -fgnu89-inline to CFLAGS.
+
+ - Also warn about missing prerequisites as we encounter them (bug
+ #24445).
+
+ - Distribute necessary files to allow users working from the
+ distributed tarball to configure with --enable-gui-tools.
+
+ - Append $(EXEEXT_FOR_BUILD) to output file name when building
+ q2c, fixing build problems on Windows.
+
+ - GSL 1.8 or later is now required.
+
+ - Build errors with --enable-relocatable were fixed.
+
+ * The German translations were removed, since native German speakers
+ found them too poor to be useful.
+
+Changes from 0.4.0 to 0.6.0:
+
+ * The PSPP license is now version 3 or later of the GNU General
+ Public License. Previously, it was version 2 or later.
+
+ * PSPP now has a graphical interface, called PSPPIRE. This
+ interface allows you to enter data and variable definitions
+ interactively. Commands may be executed in syntax form, or by
+ using the interactive dialog boxes available from the dropdown
+ menus.
+
+ * A few sample syntax files are now included in the `examples'
+ directory.
+
+ * Numerous major and minor bugs have been fixed.
+
+ Build changes:
+
+ * The INSTALL file now reflects the details of how to install
+ PSPP. It is a tailored version of the generic installation
+ instructions, instead of a verbatim copy.
+
+ * iconv, which is ordinarily installed as part of a Unix-like
+ system, is now required. If you don't have it already, you can
+ install GNU libiconv (http://www.gnu.org/software/libiconv/).
+
+ * libxml2 and zlib are new optional dependencies. They are
+ required to use PSPP's support for reading Gnumeric files.
+
+ Statistical procedure changes:
+
+ * REGRESSION is a new procedure for fitting linear models to data
+ via least-squares estimation.
+
+ * NPAR TESTS is a new procedure for non-parametric tests. In this
+ release, it supports binomial and chi-square tests.
+
+ * RANK is a new procedure to rank variables. It supports numerous
+ forms of ranking.
+
+ * FREQUENCIES can now output histograms and pie charts. These
+ features were present in earlier releases, but not documented.
+
+ User interface changes:
+
+ * In many situations where PSPP once terminated with a fatal
+ error, PSPP now recovers and continues execution.
+
+ * PSPP is now able to start up and run even if it cannot find its
+ configuration files.
+
+ * Journaling of interactive commands to a disk file is now
+ implemented. By default, journaling is enabled, to a file named
+ `pspp.jnl' in the current directory. SET JOURNAL may be used to
+ control journaling.
+
+ * The use of `+' between syntax file names on the command line to
+ prevent the dictionary from being cleared between their
+ executions is no longer supported. All syntax files are now
+ executed as if `+' had been specified.
+
+ * The -d/--define and -u/--undef command line options are no
+ longer supported. Instead, use /usr/bin/env or shell primitives
+ to define or clear environment variables before invoking PSPP.
+
+ * If a syntax file named named `rc' is found in a configuration
+ directory (such as $HOME/.pspp), it is executed before any
+ syntax file specified on the command line. The -r or
+ --no-statrc command line option may be used to disable this
+ behavior.
+
+ Output changes:
+
+ * Output configuration options have changed. Please refer to the
+ manual for a full description of the available options.
+
+ In consequence, you will need to reinstall your "devices" file.
+ "make install" will do this for you.
+
+ * Most error messages are now written to PSPP output files by
+ default. SET ERROR can be used to disable this behavior.
+
+ * When invoked interactively, PSPP now by default produces output
+ on the terminal, piping it through the "more" program.
+ Previously, by default output was written only to file
+ pspp.list. On most terminals, the page length used for output
+ automatically adapts to the terminal size, even if the terminal
+ is resized.
+
+ * ASCII driver:
+
+ - This driver now supports charts in output. Charts are written
+ as separate files that the main output file refers to. By
+ default, charts are written in PNG format to files named
+ pspp-1.png, pspp-2.png, and so on.
+
+ - Configurations are provided that use VT100 (and xterm)
+ line-drawing characters in tables. The option "-o list-vt100"
+ requests use of this device for output to pspp.list.
+
+ * PostScript driver:
+
+ - The default paper size is now determined using the PAPERSIZE
+ environment variable, or the LC_PAPER locale category on
+ systems that support it. If these are not set, the default is
+ now A4, instead of US letter. To make US letter the default,
+ set PAPERSIZE to "letter" in your environment.
+
+ - Font metrics are now read from AFM files, instead of
+ Groff-format metrics files. PostScript fonts can now be
+ embedded in output.
+
+ In consequence, you will need to install an AFM file for each
+ font used in PostScript output. "make install" will install
+ AFM files for the standard PostScript fonts, including the
+ ones that the PostScript driver uses by default.
+
+ - Standard paper sizes no longer need to be specified through a
+ configuration file. The "papersize" configuration file is no
+ longer needed, or supported.
+
+ - The PostScript prologue is no longer obtained from the
+ "ps-prologue" configuration file. This configuration file is
+ no longer needed, or supported.
+
+ * HTML driver:
+
+ - The HTML prologue is no longer obtained from the
+ "html-prologue" configuration file. This configuration file
+ is no longer needed, or supported.
+
+ Command language changes:
+
+ * The following commands are new:
+
+ - GET DATA, which currently supports reading Gnumeric files and
+ text data files. It will be extended later to read other
+ types of foreign data.
+
+ - CD, to change the current directory.
+
+ - INSERT, to execute a syntax file.
+
+ - DELETE VARIABLES, to remove variables from the active file
+ dictionary.
+
+ - ADD DOCUMENT, to add text to active file documents.
+
+ - CLOSE FILE HANDLE (a PSPP extension; see below).
+
+ - XEXPORT, a PSPP extension that is a transformation equivalent
+ to EXPORT.
+
+ * The following functions for transformation expressions are new:
+
+ - DATEDIFF, for computing the difference of two dates.
+
+ - DATESUM, for advancing a date by a specified duration.
+
+ - VALUELABEL, to obtain the value label for a value.
+
+ * PSPP now supports very long string variables (over 255 bytes
+ long).
+
+ * MATCH FILES now supports the FIRST and LAST subcommands.
+
+ * Previous versions of PSPP prohibited using commands to both read and
+ write a single file at the same time. Now, PSPP allows this, and
+ the new version of the file atomically replaces the old version.
+
+ * The following commands are no longer available. They will be
+ re-implemented in a later release:
+
+ - CLEAR TRANSFORMATIONS
+
+ - MATRIX DATA
+
+ - REPEATING DATA
+
+ * The PROCESS IF command, which was deprecated, has been removed.
+ You may replace any usage of it by SELECT IF following
+ TEMPORARY, which has the same effect.
+
+ * The output format for variables created by VECTOR may now be
+ specified as part of the VECTOR syntax.
+
+ "Scratch files", a new PSPP extension:
+
+ A scratch file, like a system file, consists of a dictionary and
+ any number of cases. Small scratch files are stored in memory;
+ one that grows too large is written to disk. By default, any file
+ handle whose name begins with # is assumed to refer to a scratch
+ file.
+
+ Scratch files can be used just about anywhere a system or portable
+ file can be used. Also, portable files are now allowed in most
+ places that system files were allowed in previous PSPP version.
+
+ A new CLOSE FILE HANDLE command allows the storage associated with
+ scratch files to be freed. It also allows file handles to be
+ reassigned to new files.
+
+ For more information on scratch files, refer to the "File Handles"
+ section in the PSPP manual. For specifics of what commands now
+ allow what kinds of files to be specified, refer to the
+ documentation on those particular commands.
+
+ Data access changes:
+
+ * Binary formats and IBM/360 formats, including ASCII/EBCDIC
+ translation, are now supported. Use FILE HANDLE to specify the
+ format of these files.
+
+ * Little-endian, big-endian, and VAX-endian formats are now
+ supported for integer binary formats when reading and writing
+ data files. The new RIB and WIB subcommands on the SET command
+ control endianness of integer data. The default is the host's
+ native endianness.
+
+ * IEEE 754, VAX, and IBM hexadecimal formats are now supported for
+ floating point binary formats when reading and writing data
+ files. The new RRB and WRB subcommands on the SET command
+ control the floating point format. The default is the host's
+ native floating point format.
+
+ * DATA LIST now supports the SKIP subcommand, to skip records at
+ the beginning of a file. For compatibility, DATA LIST now
+ treats N format as F format for FREE and LIST format input.
+
+ * The SAVE and XSAVE commands now support the UNSELECTED,
+ PERMISSIONS, NAMES, and MAP subcommands.
+
+ * The EXPORT command has been re-implemented to obtain better
+ results. Support for the UNSELECTED, DIGITS, and TYPE
+ subcommands has been added.
+
+ * For compatibility, PRINT now inserts a space at the beginning of
+ every output line, even lines that would otherwise be blank,
+ when OUTFILE is specified. (The behavior of WRITE is
+ unchanged.)
+
+ * For compatibility, PRINT EJECT now inserts the digit `1' at the
+ beginning of each line that should begin a new page.
+
+ * For compatibility, WRITE now outputs the system-missing value as
+ a field filled with spaces. Binary formats are an exception.
+ (The behavior of PRINT is unchanged.)
+
+ Documentation:
+
+ * Input and output format descriptions have been rewritten. They
+ now precisely describe what is accepted on input and written on
+ output.
+
+ * The descriptions of the PSPP system and portable file formats
+ have been extensively revised and improved.
+
+ For developers, the build system now requires Autoconf 2.60 and
+ Automake 1.10.