# Changes in TIFF v4.0.1

References
Current Version | v4.0.1 (tag Release-v4-0-1)
Previous Version | v4.0.0
Master Download Site | https://download.osgeo.org/libtiff/
Master HTTP Site | https://download.osgeo.org/libtiff/

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:

## Major changes

- None

## Software configuration changes

- `--enable-ld-version-script`: New configure option to enable shared library symbol versioning on ELF-based systems (e.g. Linux and FreeBSD) which use the GNU linker. This allows multiple major versions of libtiff to be loaded simultaneously into the same application or library without conflict, as long as all libtiffs involved are built with versioned symbols. This option is not enabled by default.

- Added libtiff private dependency on `-llzma` for pkg-config.

## Library changes

- `libtiff/tif_dir.c`, `libtiff/tif_dirread.c`: Extra caution around assumption tag fetching is always successful.

- `libtiff/tif_jpeg.c`: Extra caution for case where `sp` is `NULL`.

## Tools changes

- None

## Contributed software changes

- None