Reducing the dependencies of ImageMagick (djvulibre)

[ocroquette (Olivier Croquette)]

Currently, the ImageMagick port is unconditionally depending on the "djvulibre" port, bringing in 160 (!) indirect dependencies, including:

• dbus, and its Launch Agent
• gtk3
• cairo
• python27
• sqlite3
• docbook-xml
• ...

As a quick experiment, I removed djvulibre from the list of dependencies, and I could build ImageMagick and use "convert" successfully. I suggest to remove "djvulibre" as hard dependency and/or create a specific variant if it has added value for some users.

[mf2k (Frank Schima)]

In the future, please Cc the port maintainers (port info --maintainers ImageMagick), if any.

[ocroquette (Olivier Croquette)]

Replying to mf2k@…:

In the future, please Cc the port maintainers (port info --maintainers ImageMagick), if any.

I will, sorry.

[devernay (Frédéric Devernay)]

I think installing librsvg with the -viewer variant fixes this. The viewer variant should not be enabled by default in librsvg. I just filed #47596

[dbevans (David B. Evans)]

As of r135684, the +viewer variant of librsvg is no longer asserted by default. This removes its dependency on gtk3. If you're not using gtk3 for other reasons, this may help.

See #47596 for details.

[Schamschula (Marius Schamschula)]

I've created a djvulibre variant.

As it depends on the rsvg variant, which in turn depends on the pango variant, the variants now use the "requires" syntax to note this fact.

[Schamschula (Marius Schamschula)]

Cc Me!

[ryandesign (Ryan Carsten Schmidt)]

Replying to mschamschula@…:

As it depends on the rsvg variant, which in turn depends on the pango variant, the variants now use the "requires" syntax to note this fact.

How do you know that djvulibre support in ImageMagick requires the rsvg variant? How do you know the rsvg variant requires the pango variant?

[Schamschula (Marius Schamschula)]

Replying to ryandesign@…:

Replying to mschamschula@…:

As it depends on the rsvg variant, which in turn depends on the pango variant, the variants now use the "requires" syntax to note this fact.

How do you know that djvulibre support in ImageMagick requires the rsvg variant? How do you know the rsvg variant requires the pango variant?

I found out the hard way, while trying to build ImageMagick under El Cap, where it currently is impossible to build pango due to some system header issues.

In other words:

• If you install the rsvg variant, you need pango as a dependency, so why not install the variant?
• If you install the djvulibre variant, you need both pango and rsvg as dependencies, so why not install those variants?

[jpanetta (Julian Panetta)]

I also think it would be nice to make djvu optional; djvu currently fails to build on ARM64 (due to its librsvg and thus rust dependency). After disabling djvu--and sadly heic support due to libde265 's x86 assembly not compiling--ImageMagick builds fine.