Bug 616410

Summary:	x11-libs/goocanvas needs x11-libs/gdk-pixbuf dependency, jpeg, jpeg2k and tiff use flags
Product:	Gentoo Linux	Reporter:	Jess Haas <gentoo>
Component:	Current packages	Assignee:	Gentoo Linux Gnome Desktop Team <gnome>
Status:	RESOLVED WONTFIX
Severity:	normal
Priority:	Normal
Version:	unspecified
Hardware:	All
OS:	Linux
Whiteboard:
Package list:		Runtime testing required:	---

Description Jess Haas 2017-04-23 20:07:04 UTC

x11-libs/goocanvas relies on x11-libs/gdk-pixbuf for image loading. Goocanvas ebuild needs use flags for image types (jpeg, jpeg2 and tiff) so that packages using it can require them from gdk-pixbuf.

-Jess

Comment 1 Jess Haas 2017-04-23 20:13:38 UTC

See bug# 616414 https://bugs.gentoo.org/show_bug.cgi?id=616414

Comment 2 Gilles Dartiguelongue (RETIRED) gentoo-dev

2017-09-13 21:39:01 UTC

goocanvas depends on gtk+ which depends on gdk-pixbuf for image loading.

Features such as jpeg, tiff, etc, are generally not specified in packages up in the stack as you would end up with almost any final application just copying tons of USE flags so they can transitively depend on it in the lowest library in the stack to have this particular feature enabled.

In Gentoo, this is the reason why user can turn on or off some USE flags globally in make.conf rather than specifying everything per-package. You can still do it per-package but you have to walk through the dependency tree yourself if you want fine grained settings.