# Changes in TIFF v3.4beta024

References
Current Version | v3.4beta024 (no release tag)
Previous Version | v3.4beta018
Master Download Site | ftp://ftp.sgi.com/graphics/tiff/

This document describes the changes made to the software between the previous and current versions (see above). If you don't find something listed here, then it was not done in this timeframe, or it was not considered important enough to be mentioned. The following information is located here:

## Software configuration changes

- It is now possible to setup the software to build only the library; configure recognizes this is the intent when the `VERSION`, `tiff.alpha`, and `tif_version.c` files are in the local directory (i.e. `.`)

- configure no longer tries to setup HTML materials

- include file directories needed in building the library are now specified with a `DIRS_LIBINC` config parameter

- configure no longer checks for alternate compilers if `CC` is set; if the specified compiler is not found or is not appropriate the configuration procedure aborts

- the `port.h` file generated by configure is now used only by the library and as such as have been moved to the `libtiff` directory

- there is beginning support for building DSO's on systems other than IRIX

- configure now verifies the JPEG and zlib directory pathnames by checking for well-known include files in these directories

- configure no longer creates the `dist` directory needed only on SGI machines (for building SGI binary distributions)

- a bug was fixed whereby configure would incorrectly set `ENVOPTS` when building the software with gcc under AIX

## Library changes

- two new typedefs were added to `tiff.h`: `int8` and `uint8` for signed and unsigned 8-bit quantities, respectively; these are currently used only by programs in the `tools` directory

- the `BadFaxLines`, `CleanFaxData`, and `ConsecutiveBadFaxLines` tags are now supported with Group 4 compression

- byte order is now correctly identified on 64-bit machines

- a bug was fixed in the PackBits decoder where input data would appear short when a no-op run was present

- a bug was fixed in calculations with very wide strips

- `TIFFWriteEncodedStrip()` and `TIFFWriteRawStrip()` were extended to support dynamically growing the number of strips in an image (must set `ImageLength` prior to making calls though)

- `TIFFDefaultTileSize()` now rounds tile width and height up to a multiple of 16 pixels, as required by the TIFF 6.0 specification

- the file `version.h` is now built by a new mkversion program; this was done for portability to non-UNIX systems

- support was added for the Acorn RISC OS (from Peter Greenham)

- the builtin codec table is now made `const` when compiling under VMS so that `libtiff` can be built as a shared library

- support for the PowerPC Mac (from Ruedi Boesch)

- support for Windows NT/Windows 95 (from Scott Wagner)

## Tools changes

- the tools no longer include `port.h`

- various portability fixes; mostly to eliminate implicit assumptions about how long `int32` data types are

- PostScript Level II additions to tiff2ps from Bjorn Brox

- sgi2tiff now handles RGBA images

## Documentation changes

- the documentation has been updated to reflect the current state of the software

- some routines have been moved to different manual pages to group like-routines together

## Contributed software changes

- support was added for the Acorn RISC OS (from Peter Greenham)

- support for Windows NT/Windows 95 contributed for a previous version of this software was sort of incorporated (it's broken right now) (from Scott Wagner)