# Building the Software Distribution

- Building on all systems with CMake.
- Building on a UNIX system with Autoconf.
- Building on an MS-DOS or Windows system with nmake.
- Building on a VMS system.
- Building the Software on Other Systems.

This chapter contains step-by-step instructions on how to configure and build the TIFF software distribution. The software is most easily built on a UNIX system, but with a little bit of work it can easily be built and used on other non-UNIX platforms.

## Building on all systems with CMake

CMake may be used to generate build files for most common build systems and IDEs, and supports all UNIX-like systems as well as Windows. See the CMake website for further details. To build the software on you need to first run `cmake` to configure the build and generate the system-specific build files. This reads the top-level `CMakeLists.txt` file, which probes the target system for necessary tools and functions, checks any options you specified to configure the build, and then outputs build files configured for your system. If using `Unix Makefiles`, once configuration is done, you simply run `make` (or `gmake`) to build the software and then `make install` to do the installation. For other build systems, you do the equivalent steps with the tool for that system. For example, on any UNIX system:

    % cd ./tiff-4.0.5
    % cmake
        ...lots of messages...
    % make
        ...lots of messages...
    % make test
        ...lots of messages...
    # make install

Building is dependent on a `make` utility and a C (and optionally a C++ compiler), so you will need these tools.

In general, the software is designed such that the following targets will always be available

    make [all]      build stuff
    make test       run the test suite
    make install    build and install stuff
    make clean      remove object files, executables and cruft

### Build Trees

There are two schemes for configuring and building the software. If you intend to build the software for only one target system, you can configure the software so that it is built in the same directories as the source code.

    % gzip -dc tiff-4.0.5.tar.gz | tar -xf -
    % cd ./tiff-4.0.5
    % cmake
    % make
    % make test
    % make install

Otherwise, you can configure a build tree that is parallel to the source tree hierarchy (or in some completely different place) but which contains only configured files and files created during the build procedure.

    % gzip -dc tiff-4.0.5.tar.gz | tar -xf -
    % mkdir tiff-4.0.5-build
    % cd ./tiff-4.0.5-build
    % cmake ../tiff-4.0.5
    % make
    % make test
    % make install

This second scheme is useful for:

- building multiple targets from a single source tree
- building from a read-only source tree (e.g. if you receive the distribution on CD-ROM)
- sharing the source files via a network, but building on multiple systems
- keeping the source tree clean (unlike `autoconf`, `cmake` does not provide a `distclean` target, so out of source builds are recommended)

### Generators

The default generator for UNIX is `Unix Makefiles`, and on Windows is `NMake Makefiles` or MSBuild depending upon the setup. Run cmake --help to list all the generators available for your platform. For example, to use the Ninja build system on UNIX or Windows:

    cmake -G Ninja
    cmake --build .
    ctest -V
    cmake --build . --target install

Note that cmake --build . is a build-system-independent way of building a target; you can always use the build system directly.

Alternatively, using the MSBuild system on Windows (64-bit Release build with VS2013):

    cmake -G "Visual Studio 12 2013 Win64"
    cmake --build . --config Release
    ctest -V -C Release
    cmake --build . --config Release --target install

With the above configuration, it's also possible to open the generated solution file with the Visual Studio IDE as well as building on the command-line.

### Configuration Options

The configuration process is critical to the proper compilation, installation, and operation of the software. The `CMakeLists.txt` script runs a series of tests to decide whether or not the target system supports required functionality and, if it does not, whether it can emulate or workaround the missing functions. After running `cmake`, check the `CMakeCache.txt` file; this contains all the results of the checks performed and the options set by the user. If `cmake` failed to run, check `CMakeFiles/CMakeOutput.log` and `CMakeFiles/CMakeError.log`; these should record the error which caused the failure.

A second function of the configure script is to set the default configuration parameters for the software. Of particular note are the directories where the software is to be installed. By default the software is installed in the /usr/local hierarchy. To change this behaviour the appropriate parameters can be specified on the command line. Run cmake --help to get a full list of possible options, and cmake -LH to list all the configurable options for this software package, or cmake -LAH to show all advanced options in addition. Standard installation related options are shown below.

    Installation directories:
      CMAKE_INSTALL_PREFIX

    Fine tuning of the installation directories:
      CMAKE_INSTALL_BINDIR            user executables [PREFIX/bin]
      CMAKE_INSTALL_SBINDIR           system admin executables [PREFIX/sbin]
      CMAKE_INSTALL_LIBEXECDIR        program executables [PREFIX/libexec]
      CMAKE_INSTALL_SYSCONFDIR        read-only single-machine data [PREFIX/etc]
      CMAKE_INSTALL_SHAREDSTATEDIR    modifiable architecture-independent data [PREFIX/com]
      CMAKE_INSTALL_LOCALSTATEDIR     modifiable single-machine data [PREFIX/var]
      CMAKE_INSTALL_LIBDIR            object code libraries [PREFIX/lib]
      CMAKE_INSTALL_INCLUDEDIR        C header files [PREFIX/include]
      CMAKE_INSTALL_OLDINCLUDEDIR     C header files for non-gcc [/usr/include]
      CMAKE_INSTALL_DATAROOTDIR       read-only arch.-independent data root [PREFIX/share]
      CMAKE_INSTALL_DATADIR           read-only architecture-independent data [DATAROOTDIR]
      CMAKE_INSTALL_LOCALEDIR         locale-dependent data [DATAROOTDIR/locale]
      CMAKE_INSTALL_MANDIR            man documentation [DATAROOTDIR/man]
      CMAKE_INSTALL_DOCDIR            documentation root [DATAROOTDIR/doc/tiff]

Also see the CMake documentation for additional variables which may be set.

### Configuring Optional Packages/Support

The TIFF software comes with several packages that are installed only as needed, or only if specifically configured at the time the configure script is run. Packages can be configured via the cmake commandline parameters.

Static/Shared Objects Support
  `BUILD_SHARED_LIBS[=ON|OFF] build shared libraries [default=ON]`

  This option controls whether or not to configure the software to build a shared and static binaries for the TIFF library. Use of shared libraries can significantly reduce the disk space needed for users of the TIFF software. If shared libraries are not used then the code is statically linked into each application that uses it.

  `ld-version-script[=ON|OFF] Enable linker version script (default is ON)`

  Add shared library symbol versioning on ELF-based systems (e.g. Linux and FreeBSD) which use the GNU linker. This is needed if several major versions of libtiff might be loaded at once into the same program.

JPEG Support
  `jpeg[=ON|OFF] enable IJG JPEG library usage (required for JPEG compression, enabled by default)
  JPEG_INCLUDE_DIR=DIR location of IJG JPEG library headers
  JPEG_LIBRARY=DIR location of IJG JPEG library binary)`
  The `JPEG` package enables support for the handling of TIFF images with JPEG-encoded data. Support for JPEG-encoded data requires the Independent JPEG Group (IJG) `libjpeg` distribution; this software is available at http://www.ijg.org/. cmake script automatically tries to search for a working IJG JPEG installation. If it fails to find library, JPEG support will be automatically disabled. If you want specify the exact paths to library binary and headers, use above options for that.
ZIP Support
  The `ZIP` support enables support for the handling of TIFF images with deflate-encoded data (enabled by default if available). Support for deflate-encoded data requires the freely available `zlib` distribution written by Jean-loup Gailly and Mark Adler; this software is available at http://www.zlib.org/.

## Building on a UNIX System with Autoconf

To build the software on a UNIX system you need to first run the configure shell script that is located in the top level of the source directory. This script probes the target system for necessary tools and functions and constructs a build environment in which the software may be compiled. Once configuration is done, you simply run `make` (or `gmake`) to build the software and then `make install` to do the installation; for example:

    % cd ./tiff-4.0.5
    % ./configure
        ...lots of messages...
    % make
        ...lots of messages...
    % make check
        ...lots of messages...
    # make install

Supplied makefiles are dependent on a `make` utility and a C (and optionally a C++ compiler), so you will need these tools.

In general, the software is designed such that the following should be ``make-able'' in each directory:

    make [all]      build stuff
    make check      run the test suite
    make install    build and install stuff
    make clean      remove object files, executables and cruft
    make distclean  remove everything, that can be recreated

Note that after running "`make distclean`" the `configure` script must be run again to create the Makefiles and other make-related files.

### Build Trees

There are two schemes for configuring and building the software. If you intend to build the software for only one target system, you can configure the software so that it is built in the same directories as the source code.

    % gzip -dc tiff-4.0.5.tar.gz | tar -xf -
    % cd ./tiff-4.0.5
    % ./configure
    % make
    % make check
    % make install

Otherwise, you can configure a build tree that is parallel to the source tree hierarchy (or in some completely different place) but which contains only configured files and files created during the build procedure.

    % gzip -dc tiff-4.0.5.tar.gz | tar -xf -
    % mkdir tiff-4.0.5-build
    % cd ./tiff-4.0.5-build
    % ../tiff-4.0.5/configure
    % make
    % make check
    % make install

This second scheme is useful for:

- building multiple targets from a single source tree
- building from a read-only source tree (e.g. if you receive the distribution on CD-ROM)
- sharing the source files via a network, but building on multiple systems

### Configuration Options

The configuration process is critical to the proper compilation, installation, and operation of the software. The configure script runs a series of tests to decide whether or not the target system supports required functionality and, if it does not, whether it can emulate or workaround the missing functions. This procedure is fairly complicated and, due to the nonstandard nature of most UNIX systems, prone to error. The first time that you configure the software for use you should check the output from the configure script and look for anything that does not make sense for your system.

A second function of the configure script is to set the default configuration parameters for the software. Of particular note are the directories where the software is to be installed. By default the software is installed in the /usr/local hierarchy. To change this behaviour the appropriate parameters can be specified on the command line to configure. Run ./configure --help to get a full list of possible options. Standard installation related options are shown below.

    Installation directories:
      --prefix=PREFIX         install architecture-independent files in PREFIX
                              [/usr/local]
      --exec-prefix=EPREFIX   install architecture-dependent files in EPREFIX
                              [PREFIX]

    By default, `make install' will install all the files in
    `/usr/local/bin', `/usr/local/lib' etc.  You can specify
    an installation prefix other than `/usr/local' using `--prefix',
    for instance `--prefix=$HOME'.

    For better control, use the options below.

    Fine tuning of the installation directories:
      --bindir=DIR            user executables [EPREFIX/bin]
      --sbindir=DIR           system admin executables [EPREFIX/sbin]
      --libexecdir=DIR        program executables [EPREFIX/libexec]
      --sysconfdir=DIR        read-only single-machine data [PREFIX/etc]
      --sharedstatedir=DIR    modifiable architecture-independent data [PREFIX/com]
      --localstatedir=DIR     modifiable single-machine data [PREFIX/var]
      --libdir=DIR            object code libraries [EPREFIX/lib]
      --includedir=DIR        C header files [PREFIX/include]
      --oldincludedir=DIR     C header files for non-gcc [/usr/include]
      --datarootdir=DIR       read-only arch.-independent data root [PREFIX/share]
      --datadir=DIR           read-only architecture-independent data [DATAROOTDIR]
      --localedir=DIR         locale-dependent data [DATAROOTDIR/locale]
      --mandir=DIR            man documentation [DATAROOTDIR/man]
      --docdir=DIR            documentation root [DATAROOTDIR/doc/tiff]
      --htmldir=DIR           html documentation [DOCDIR]

    Program names:
      --program-prefix=PREFIX            prepend PREFIX to installed program names
      --program-suffix=SUFFIX            append SUFFIX to installed program names
      --program-transform-name=PROGRAM   run sed PROGRAM on installed program names

### Configuring Optional Packages/Support

The TIFF software comes with several packages that are installed only as needed, or only if specifically configured at the time the configure script is run. Packages can be configured via the configure script commandline parameters.

Static/Shared Objects Support
  `--enable-shared[=PKGS] build shared libraries [default=yes]
  --enable-static[=PKGS] build static libraries [default=yes]`

  These options control whether or not to configure the software to build a shared and static binaries for the TIFF library. Use of shared libraries can significantly reduce the disk space needed for users of the TIFF software. If shared libraries are not used then the code is statically linked into each application that uses it. By default both types of binaries is configured.

  `--enable-rpath Enable runtime linker paths (-R libtool option)`

  Add library directories (see other options below) to the TIFF library run-time linker path.

  `--enable-ld-version-script Enable linker version script (default is disabled)`

  Add shared library symbol versioning on ELF-based systems (e.g. Linux and FreeBSD) which use the GNU linker. This is needed if several major versions of libtiff might be loaded at once into the same program.

JPEG Support
  `--disable-jpeg disable IJG JPEG library usage (required for JPEG compression, enabled by default) --with-jpeg-include-dir=DIR location of IJG JPEG library headers --with-jpeg-lib-dir=DIR location of IJG JPEG library binary)`
  The `JPEG` package enables support for the handling of TIFF images with JPEG-encoded data. Support for JPEG-encoded data requires the Independent JPEG Group (IJG) `libjpeg` distribution; this software is available at http://www.ijg.org/. configure script automatically tries to search for a working IJG JPEG installation. If it fails to find library, JPEG support will be automatically disabled. If you want specify the exact paths to library binary and headers, use above switches for that.
ZIP Support
  The `ZIP` support enables support for the handling of TIFF images with deflate-encoded data. Support for deflate-encoded data requires the freely available `zlib` distribution written by Jean-loup Gailly and Mark Adler; this software is available at http://www.zlib.org/. If ZIP support is enabled the `DIRS_LIBINC` and `DIR_GZLIB` parameters should also be set (see below). By default this package is not configured.

## Building the Software under Windows 2000/XP/7/8/10 with nmake

With Microsoft Visual C++ installed, and properly configured for commandline use (you will likely need to source VCVARS32.BAT in AUTOEXEC.bAT or somewhere similar) you should be able to use the provided `makefile.vc`.

The source package is delivered using Unix line termination conventions, which work with MSVC but do not work with Windows 'notepad'. If you use unzip from the Info-Zip package, you can extract the files using Windows normal line termination conventions with a command similar to:

      unzip -aa -a tiff-4.0.5.zip

By default the nmake-based libtiff build does not depend on any additional libraries. Normally libtiff should be built with at least JPEG and ZIP support so that it can open JPEG and ZIP-compressed TIFF files. In order to add additional libraries (e.g. libjpeg, zlib, jbigkit), build those libraries according to their own particular build instructions, and then edit 'nmake.opt' (using a capable plain-text editor) to enable use of the libraries, including specifying where the libraries are installed. It is also necessary to edit libtiff/tiffconf.vc.h to enable the related configuration defines (JPEG_SUPPORT, OJPEG_SUPPORT, PIXARLOG_SUPPORT, ZIP_SUPPORT), or to disable features which are normally included by default. Ignore the comment at the top of the libtiff/tiffconf.vc.h file which says that it has no influence on the build, because the statement is not true for Windows. Please note that the nmake build copies tiffconf.vc.h to tiffconf.h, and copies tif_config.vc.h to tif_config.h, overwriting any files which may be present. Likewise, the 'nmake clean' step removes those files.

To build using the provided makefile.vc you may use:

      C:\tiff-4.0.5> nmake /f makefile.vc clean
      C:\tiff-4.0.5> nmake /f makefile.vc

        or (the hard way)

      C:\tiff-4.0.5> cd port
      C:\tiff-4.0.5\port> nmake /f makefile.vc clean
      C:\tiff-4.0.5\port> nmake /f makefile.vc
      C:\tiff-4.0.5> cd ../libtiff
      C:\tiff-4.0.5\libtiff> nmake /f makefile.vc clean
      C:\tiff-4.0.5\libtiff> nmake /f makefile.vc
      C:\tiff-4.0.5\libtiff> cd ..\tools
      C:\tiff-4.0.5\tools> nmake /f makefile.vc clean
      C:\tiff-4.0.5\tools> nmake /f makefile.vc

This will build the library file `libtiff\libtiff\libtiff.lib`.

The makefile also builds a DLL (libtiff.dll) with an associated import library (libtiff_i.lib). Any builds using libtiff will need to include the LIBTIFF\LIBTIFF directory in the include path.

The `libtiff\tools\makefile.vc` should build .exe's for all the standard TIFF tool programs.

## Building the Software on a VMS System

The VMS port was done by Karsten Spang (krs@kampsax.dk), who also "sort of" maintains it. The VMS specific files are not in the main directories. Instead they are placed under `[.CONTRIB.VMS...]` in the distribution tree. Installation: It is assumed that you have unpacked the tar file into a VMS directory tree, in this text called DISK:[TIFF].

1. Move the VMS specific files to their proper directories.

       $ SET DEFAULT DISK:[TIFF.CONTRIB.VMS]
       $ RENAME [.LIBTIFF]*.* [-.-.LIBTIFF]
       $ RENAME [.TOOLS]*.* [-.-.TOOLS]

2. Compile the library.

       $ SET DEFAULT DISK:[TIFF.LIBTIFF]
       $ @MAKEVMS

3. Compile the tools.

       $ SET DEFAULT DISK:[TIFF.TOOLS]
       $ @MAKEVMS

4. Define the programs.

       $ DEFINE TIFFSHR DISK:[TIFF.LIBTIFF]TIFFSHR
       $ FAX2PS    :==$DISK:[TIFF.TOOLS]FAX2PS
       $ FAX2TIFF  :==$DISK:[TIFF.TOOLS]FAX2TIFF
       $ GIF2TIFF  :==$DISK:[TIFF.TOOLS]GIF2TIFF
       $ PAL2RGB   :==$DISK:[TIFF.TOOLS]PAL2RGB
       $ PPM2TIFF  :==$DISK:[TIFF.TOOLS]PPM2TIFF
       $ RAS2TIFF  :==$DISK:[TIFF.TOOLS]RAS2TIFF
       $ RGB2YCBCR :==$DISK:[TIFF.TOOLS]RGB2YCBCR
       $ THUMBNAIL :==$DISK:[TIFF.TOOLS]THUMBNAIL
       $ TIFF2BW   :==$DISK:[TIFF.TOOLS]TIFF2BW
       $ TIFF2PS   :==$DISK:[TIFF.TOOLS]TIFF2PS
       $ TIFFCMP   :==$DISK:[TIFF.TOOLS]TIFFCMP
       $ TIFFCP    :==$DISK:[TIFF.TOOLS]TIFFCP
       $ TIFFDITHER:==$DISK:[TIFF.TOOLS]TIFFDITHER
       $ TIFFDUMP  :==$DISK:[TIFF.TOOLS]TIFFDUMP
       $ TIFFINFO  :==$DISK:[TIFF.TOOLS]TIFFINFO
       $ TIFFMEDIAN:==$DISK:[TIFF.TOOLS]TIFFMEDIAN
       $ TIFFSPLIT :==$DISK:[TIFF.TOOLS]TIFFSPLIT
       $ YCBCR     :==$DISK:[TIFF.TOOLS]YCBCR

You will want to add these lines to your `LOGIN.COM` file, after changing the name of the directory that you have used on your machine.

This release has been tested on OpenVMS/VAX 5.5-2, using VAX C 3.2. A previous release was tested under OpenVMS/AXP ?.? using DEC C ?.?, it is believed that this release as well works on AXP. The code contains some GNU C specific things. This does *not* imply, however, that the VAX/GCC configuration has been tested, *it has not*.

The command procedures (`MAKEVMS.COM`) for building the library and tools, is believed to choose the correct options for the VAX and AXP cases automatically.

On the AXP, IEEE floating point is used by default. If you want VAX floating point, remove the `/FLOAT=IEEE_FLOAT` qualifier, and change `HAVE_IEEEFP=1` to `HAVE_IEEEFP=0` in the `MAKEVMS.COM` files in both the libtiff and tools directories.

### Compiling your own program on a VMS system:

When compiling a source file in which you `"#include <tiffio.h>"`, use the following command

        $ CC/INCLUDE=DISK:[TIFF.LIBTIFF]

This ensures that the header file is found. On the AXP, also add `/FLOAT=IEEE_FLOAT` (if used when building the library).

### Linking your own program to the TIFF library on a VMS system:

You can link to the library in two ways: Either using the shareable library, or using the object library. On the VAX these possibilities are:

1. Using the shareable TIFF library.

       $ LINK MY_PROGRAM,DISK:[TIFF.LIBTIFF]TIFF/OPTIONS,SYS$INPUT:/OPTIONS
           SYS$SHARE:VAXCRTL/SHAREABLE

2. Using the TIFF object library.

       $ LINK MY_PROGRAM, -
           DISK:[TIFF.LIBTIFF]TIFF/LIBRARY/INCLUDE=(TIF_FAX3SM,TIF_CODEC), -
           SYS$INPUT:/OPTIONS
           SYS$SHARE:VAXCRTL/SHAREABLE

On AXP (and possibly also using DEC C on VAX) the corresponding commands are

1. Using the shareable TIFF library.

       $ LINK MY_PROGRAM,DISK:[TIFF.LIBTIFF]TIFF/OPTIONS

2. Using the TIFF object library.

       $ LINK MY_PROGRAM,DISK:[TIFF.LIBTIFF]TIFF/LIBRARY

Method 1 uses the shortest link time and smallest `.EXE` files, but it requires that `TIFFSHR` is defined as above at link time and at run time. Using the compilation procedure above, the tools are linked in this way.

Method 2 gives somewhat longer link time and larger `.EXE` files, but does not require `TIFFSHR` to be defined. This method is recommended if you want to run your program on another machine, and for some reason don't want to have the library on that machine. If you plan to have more than one program (including the tools) on the machine, it is recommended that you copy the library to the other machine and use method 1.

## Building the Software on Other Systems

This section contains information that might be useful if you are working on a non-UNIX system that is not directly supported. All library-related files described below are located in the libtiff directory.

The library requires two files that are generated on-the-fly. The file tif_fax3sm.c has the state tables for the Group 3 and Group 4 decoders. This file is generated by the `mkg3states` program on a UNIX system; for example,

    cd libtiff
    cc -o mkg3states mkg3states.c
    rm -f tif_fax3sm.c
    ./mkg3states -c const tif_fax3sm.c

The `-c` option can be used to control whether or not the resutling tables are generated with a `const` declaration. The `-s` option can be used to specify a C storage class for the table declarations. The `-b` option can be used to force data values to be explicitly bracketed with ``{}'' (apparently needed for some MS-Windows compilers); otherwise the structures are emitted in as compact a format as possible. Consult the source code for this program if you have questions.

The second file required to build the library, version.h, contains the version information returned by the `TIFFGetVersion` routine. This file is built on most systems using the `mkversion` program and the contents of the `VERSION` and `tiff.alpha` files; for example,

    cd libtiff
    cc -o mkversion mkversion.c
    rm -f version.h
    ./mkversion -v ../VERSION -a ../dist/tiff.alpha version.h

Otherwise, when building the library on a non-UNIX system be sure to consult the files tiffcomp.h and tiffconf.h. The former contains system compatibility definitions while the latter is provided so that the software configuration can be controlled on systems that do not support the make facility for building the software.

Systems without a 32-bit compiler may not be able to handle some of the codecs in the library; especially the Group 3 and 4 decoder. If you encounter problems try disabling support for a particular codec; consult the documentation.

Programs in the tools directory are written to assume an ANSI C compilation environment. There may be a few POSIX'isms as well. The code in the port directory is provided to emulate routines that may be missing on some systems. On UNIX systems the `configure` script automatically figures out which routines are not present on a system and enables the use of the equivalent emulation routines from the port directory. It may be necessary to manually do this work on a non-UNIX system.

## Checking out the Software

Assuming you have working versions of `tiffgt` and `tiffsv`, you can just use them to view any of the sample images available for testing (see the section on obtaining the test images). Otherwise, you can do a cursory check of the library with the `tiffcp` and `tiffcmp` programs. For example,

    tiffcp -lzw cramps.tif x.tif
    tiffcmp cramps.tif x.tif

(`tiffcmp` should be silent if the files compare correctly).

## Table of Contents

The following files makup the core library:

    libtiff/tiff.h                  TIFF spec definitions
    libtiff/tiffcomp.h              non-UNIX OS-compatibility definitions
    libtiff/tiffconf.h              non-UNIX configuration definitions
    libtiff/tiffio.h                public TIFF library definitions
    libtiff/tiffiop.h               private TIFF library definitions
    libtiff/t4.h                    CCITT Group 3/4 code tables+definitions
    libtiff/tif_dir.h               private defs for TIFF directory handling
    libtiff/tif_fax3.h              CCITT Group 3/4-related definitions
    libtiff/tif_predict.h           private defs for Predictor tag support
    libtiff/uvcode.h                LogL/LogLuv codec-specific definitions
    libtiff/version.h               version string (generated by Makefile)
    libtiff/tif_apple.c             Apple-related OS support
    libtiff/tif_atari.c             Atari-related OS support
    libtiff/tif_aux.c               auxilary directory-related functions
    libtiff/tif_close.c             close an open TIFF file
    libtiff/tif_codec.c             configuration table of builtin codecs
    libtiff/tif_compress.c          compression scheme support
    libtiff/tif_dir.c               directory tag interface code
    libtiff/tif_dirinfo.c           directory known tag support code
    libtiff/tif_dirread.c           directory reading code
    libtiff/tif_dirwrite.c          directory writing code
    libtiff/tif_dumpmode.c          "no" compression codec
    libtiff/tif_error.c             library error handler
    libtiff/tif_fax3.c              CCITT Group 3 and 4 codec
    libtiff/tif_fax3sm.c            G3/G4 state tables (generated by mkg3states)
    libtiff/tif_flush.c             i/o and directory state flushing
    libtiff/tif_getimage.c          TIFFRGBAImage support
    libtiff/tif_jpeg.c              JPEG codec (interface to the IJG distribution)
    libtiff/tif_luv.c               SGI LogL/LogLuv codec
    libtiff/tif_lzw.c               LZW codec
    libtiff/tif_msdos.c             MSDOS-related OS support
    libtiff/tif_next.c              NeXT 2-bit scheme codec (decoding only)
    libtiff/tif_open.c              open and simply query code
    libtiff/tif_packbits.c          Packbits codec
    libtiff/tif_pixarlog.c          Pixar codec
    libtiff/tif_predict.c           Predictor tag support
    libtiff/tif_print.c             directory printing support
    libtiff/tif_read.c              image data reading support
    libtiff/tif_strip.c             some strip-related code
    libtiff/tif_swab.c              byte and bit swapping support
    libtiff/tif_thunder.c           Thunderscan codec (decoding only)
    libtiff/tif_tile.c              some tile-related code
    libtiff/tif_unix.c              UNIX-related OS support
    libtiff/tif_version.c           library version support
    libtiff/tif_vms.c               VMS-related OS support
    libtiff/tif_warning.c           library warning handler
    libtiff/tif_win3.c              Windows-3.1-related OS support
    libtiff/tif_win32.c             Win32 (95/98/NT) related OS support
    libtiff/tif_write.c             image data writing support
    libtiff/tif_zip.c               Deflate codec

    libtiff/mkg3states.c            program to generate G3/G4 decoder state tables
    libtiff/mkspans.c               program to generate black-white span tables
    libtiff/mkversion.c             program to generate libtiff/version.h.

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