Some programs, like indesign, only work with premultiplied alpha in TIFF. To
make TIFFs which are compatible with these programs, we'll need an extra
TIFF save flag (perhaps premultiply?) to premultiply alpha and save as
EXTRASAMPLE_ASSOCALPHA.
see https://github.com/libvips/libvips/issues/2192
only include source files in make dist for libnsgif and module/
we were just including the whole directory, which stopped the derived
files (eg. the .la archives) from being rebuilt on other platforms
By default, a dynamically loadable module is built for *magick (i.e.
`--with-magick=module`) when:
* ImageMagick or GraphicsMagick is found;
* GModule is supported (`gmodule_supported` pkg-config variable).
This can be overridden on the command line with:
* `--without-magick` - to disable *magick usage;
* `--with-magick[=yes]` - to restore the previous behavior;
* `--disable-modules` - to disable the build of dynamic modules.
By default, a dynamically loadable module is built for poppler (i.e.
`--with-poppler=module`) when:
* poppler is found;
* GModule is supported (`gmodule_supported` pkg-config variable).
This can be overridden on the command line with:
* `--without-poppler` - to disable poppler usage;
* `--with-poppler[=yes]` - to restore the previous behavior;
* `--disable-modules` - to disable the build of dynamic modules.
By default, a dynamically loadable module is built for libheif (i.e.
`--with-heif=module`) when:
* libheif is found;
* GModule is supported (`gmodule_supported` pkg-config variable).
This can be overridden on the command line with:
* `--without-heif` - to disable libheif usage;
* `--with-heif[=yes]` - to restore the previous behavior;
* `--disable-modules` - to disable the build of dynamic modules.
By default, a dynamically loadable module is built for OpenSlide (i.e.
`--with-openslide=module`) when:
* OpenSlide is found;
* GModule is supported (`gmodule_supported` pkg-config variable).
This can be overridden on the command line with:
* `--without-openslide` - to disable OpenSlide usage;
* `--with-openslide[=yes]` - to restore the previous behavior;
* `--disable-modules` - to disable the build of dynamic modules.
