Bug#1032417: libgl2ps1.4: Allow gl2ps to export SVG files with embedded PNG images

[Pantxo Diribarne]

Package: libgl2ps1.4
Version: 1.4.0+dfsg1-2
Severity: important

Dear Maintainer,

* What led up to the situation?
GNU Octave can't export figures containing image objects to SVG format.

* What exactly did you do (or not do) that was effective (or ineffective)?
The following Octave code fails:
image ()
print toto.svg

* What was the outcome of this action?
The image is absent from the resulting figure. Warning message:
GL2PS warning: GL2PS must be compiled with PNG support in order to embed
images
in SVG streams

* What outcome did you expect instead?
This should work, and it does if I compile GL2PS with PNG support (I only
have
to install libpng-dev for that to happen automatically) and LD_PRELOAD this
library before running Octave.

Thanks for your work.

-- System Information:
Debian Release: bullseye/sid
  APT prefers focal-updates
  APT policy: (500, 'focal-updates'), (500, 'focal-security'), (500,
'focal')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 5.4.0-137-generic (SMP w/4 CPU cores)
Locale: LANG=fr_FR.UTF-8, LC_CTYPE=fr_FR.UTF-8 (charmap=UTF-8),
LANGUAGE=fr_FR:en_US:en (charmap=UTF-8)
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages libgl2ps1.4 depends on:
ii  libc6   2.31-0ubuntu9.9
ii  libgl1  1.3.2-1~ubuntu0.20.04.2

libgl2ps1.4 recommends no packages.

libgl2ps1.4 suggests no packages.

-- no debconf information
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