Imager::Install(3pm)

NAME
Imager::Install - installation notes for Imager

SYNOPSIS
  perl Makefile.PL
  make
  make test
  make install

DESCRIPTION
Assuming you have all of your required libraries in the places Imager looks, you should be able to use the standard mantra:

  perl Makefile.PL
  make
  make test
  make install

to install Imager.

If you've installed libraries in places Imager doesn't look, you can supply extra locations either with command-line options:

  perl Makefile.PL --libpath=/home/tony/local/lib --incpath=/home/tony/local/include

or with environment variables:

  export IM_LIBPATH=/home/tony/local/lib IM_INCPATH=/home/tony/local/include
  perl Makefile.PL

Imager's Makefile.PL produces an epilogue indicating which libraries have and haven't been found, for example:

  Libraries found:
    FT2
    GIF
    JPEG
    PNG
    T1
    TIFF
  Libraries *not* found:
    Win32

If a library you expect to be found isn't on this list, use the "--verbose" or "-v" option to produce way too much information from Imager's search for the libraries:

  perl Makefile.PL -v

If you can't resolve this, then run

  perl errep.perl

and include the (large) generated report.txt in your email to:

  bug-Imager@rt.cpan.org

There are other options used to configure how Imager is built:

"--nolog"
    build Imager without logging support. This will speed up Imager a little. You can also remove logging by setting the "IMAGER_NOLOG" environment variable to a true value.

"--coverage"
    used to build Imager for "gcov" coverage testing. This is intended for development and also requires options supplied to "make".

"--assert"
    build Imager with assertions enabled.

"--tracecontext"
    build Imager to trace context object management to "stderr" for debugging.

  Build time environment variables

•   "IMAGER_NOLOG" - build Imager with logging disabled.

•   "IMAGER_DEBUG_MALLOC" - build Imager with it's debug malloc wrappers. This is not compatible with threaded code.

•   "IM_INCPATH" - equivalent to "--incpath".

•   "IM_LIBPATH" - equivalent to "--libpath".

•   "IM_VERBOSE" - equivalent to "--verbose"

•   "IM_CFLAGS" - extra C compiler flags.

•   "IM_LFLAGS" - extra linker flags.

•   "IM_DFLAGS" - extra preprocessor flags.

EXTERNAL LIBRARIES
Some of the file format and font modules included with Imager use external libraries, which should be installed before you try to install Imager itself.

If you don't have the libraries installed then Imager itself will install successfully, but the file format or font support module won't be.

Preferably the latest version of each library should be used, simple because it has the latest security fixes.

  PNG - "libpng"
Imager::File::PNG uses "libpng"
 <http://www.libpng.org/pub/png/libpng.html> for PNG image file support.

Debian package: "libpng-dev"

Redhat package: "libpng-devel"

Cygwin: "libpng-devel"

  TIFF - "libtiff"
Imager::File::TIFF uses "libtiff" <http://www.remotesensing.org/libtiff/> for GIF image file support.

Version 3.6.0 or later is required to avoid an exploit with infinite IFD loops, though it's possible some distributions have applied the fix to older versions as a security fix.

Version 3.9.0 is rejected during the probe process due to a serious bug, fixed in 3.9.1.

Debian package: "libtiff4-dev"

Redhat package: "libtiff-devel"

Cygwin: "libtiff-devel"

  GIF - "libgif"
Imager::File::GIF uses "libgif" <http://sourceforge.net/projects/giflib/> for GIF image file support.

"libgif" releases 4.2.0 and 5.0.0 are specifically not supported, due to bugs in those versions.

Release 4.1.4 or later should be used.

"giflib" 3 is no longer supported.

"libungif" is no longer supported as an alternative.

Debian package: "libgif-dev"

Redhat package: "giflib-devel"

Cygwin: "libgif-devel"

  JPEG - "libjpeg"
Imager::File::JPEG uses "libjpeg" <http://www.ijg.org/> for JPEG image file support.

You may also use "libjpeg-turbo" <http://sourceforge.net/projects/libjpeg-turbo/>.

To install older releases of "libjpeg" from source, you'll need to run:

  make install-lib

to install the libraries. "make install" only installs the program binaries.

Redhat package: "libjpeg-devel"

Debian package: "libjpeg-dev"

Cygwin: "libjpeg-devel"

  Freetype 2.x - "libfreetype"
Imager::Font::FT2 uses Freetype 2 ("libfreetype") <http://www.freetype.org/> for font support, supporting too many font formats to mention here.

This is the recommended library to use for font support.

Debian package: "libfreetype6-dev"

Redhat package: "freetype-devel"

Cygwin: "libfreetype-devel"

  Win32 GDI fonts
Imager::Font::W32 uses Win32 GDI <http://msdn.microsoft.com/en-us/library/dd145203%28v=vs.85%29.aspx> to render text using installed Windows fonts.

This requires Win32 SDK headers and libraries, and is only expected to work on native Win32 or Cygwin.

For this to work under Cygwin, install the "w32api-headers" and "w32api-runtime" packages.

  "t1lib"
Imager::Font::T1 uses "t1lib" <http://www.t1lib.org/> for font support, supporting Postscript Type 1 fonts only.

T1Lib is abandonware, the latest released version has several bugs that reliably crash on 64-bit systems.

Expect "Imager::Font::T1" to be unbundled from the Imager distribution at some point.

Debian package: "libt1-dev"

Redhat package: "t1lib-devel"

  Freetype 1.x - "libttf"
Imager uses Freetype 1 ("libttf") <http://www.freetype.org/> if available for font support, supporting TTF fonts only.

Freetype 1.x is essentially unsupported and shouldn't be used for new code.

Expect Freetype 1 support to be removed from Imager at some point.

PLATFORM SPECIFICS

  Linux
Several distributions include an Imager package, but they are typically several releases behind due to the nature of release cycles.

Imager typically supports the external libraries as packaged with any supported release of Linux.

Debian

To install the libraries used by Imager under Debian (or Ubuntu), run as root (or with sudo):

  apt-get install libgif-dev libjpeg8-dev libtiff4-dev libpng12-dev libfreetype6-dev

You may also need to install development tools:

  apt-get install build-essential

Redhat

To install the libraries used by Imager under Redhat and related Linux distributions, run as root (or sudo):

  yum install giflib-devel libjpeg-devel libtiff-devel libpng-devel freetype-devel

To install the development tools needed:

  yum install gcc

(which appears to be enough on a base Redhat-like install) or the more commonly recommended recipe:

  yum groupinstall "Development Tools"

which is massive overkill.

  Mac OS X
Building libraries

The default perl build in Snow Leopard and Lion is a fat binary, and default builds of "giflib", "libpng" and "libjpeg" (and maybe other libraries) will produce link failures.

To avoid this you need to supply a "CFLAGS" parameter to the library's configure script, but since the "-arch" flag conflicts with the options used to build the dependency files, you need to supply another flag to disable dependency tracking.

Snow Leopard fat binaries include "i386", "x86_64" and "PPC" objects, hence you would run configure like:

  ./configure --disable-dependency-tracking CFLAGS='-arch x86_64 -arch i386 -arch ppc'

Lion doesn't support "PPC", so there you run configure like:

  ./configure --disable-dependency-tracking CFLAGS='-arch x86_64 -arch i386'

For "libgif" you might also want to supply the "--without-x" option:

  ./configure --disable-dependency-tracking --without-x CFLAGS='-arch x86_64 -arch i386'

If you copy library files into place manually, you may need to run "ranlib" on them in their new location:

  ranlib /usr/local/lib/libgif.a

Macintosh "dfont" and suitcase font support

Through Freetype 2.1, Imager can use Macintosh "DFON" (".dfont") fonts and suitcase font files.

If you want to be able to use more than just the first face in the font file though, you will need to configure "freetype2" with the --with-old-mac-fonts option:

  ./configure --with-old-mac-fonts

You can use the index option to get to the other font faces in the file:

  # get the second face from $file
  my $font = Imager::Font->new(file=>$file, index=>1)
    or die Imager->errstr;

If you're using a suitcase font, you will also need to force the use of Freetype 2 with the type argument:

  my $font = Imager::Font->new(file=>$suitcase, type=>'ft2', index=>$index)
    or die Imager->errstr;

  Microsoft Windows
The simplest way to install the libraries used by Imager is to install Strawberry perl <http://strawberryperl.com/>.

You can then use either the bundled Imager, or install from CPAN.

If you get errors from your make tool, make sure you're using the same make that was used to build your perl - "nmake" for Visual C/C++ and "dmake" for MinGW, run:

  perl -V:make

to see which make was used to build your perl.

  Cygwin
To build Imager with as much library support as possible on Cygwin, install the following packages:

  libjpeg-devel libpng-devel libgif-devel libtiff-devel
  libfreetype-devel t1lib-devel w32api-headers w32api-runtime

If you see an error under cygwin during testing along the lines of:

  C:\cygwin\bin\perl.exe: *** unable to remap C:\cygwin\...some dll to the
    same address as parent (0x...) != 0x....

you will need to install the cygwin "rebase" package and run:

  $ rebaseall -v

or possibly, just:

  $ perlrebase

will fix the problem. 64-bit Cygwin significantly reduces occurrences of this problem.

Other issues

  Freetype 1.x vs Freetype 2.x
Freetype 1.x is no longer recommended, is no longer supported upstream, and receives only limited updates in Imager.

These two libraries have some conflicting include file names, but as long as you don't put the Freetype 2.x freetype.h directory in the include path it should all work.

Put the directory containing ft2build.h in the include path, but not the directory containing the freetype 2.x freetype.h.

If you see compilation errors from font.c you've probably made the mistake of putting the Freetype 2.x freetype.h directory into the include path.

To see which directories should be in the include path, try:

  freetype-config --cflags

Ideally, "freetype-config" should be in the PATH when building Imager with freetype 2.x support, in which case Imager::Font::FT2 can configure itself.

AUTHOR
Tony Cook <tonyc@cpan.org>, Arnar M. Hrafnkelsson