The ebuild for x11-libs/cairo-9999 has RDEPEND >=x11-libs/pixman-0.32.4, however it requires x11-libs/pixman>=0.36.0 Build will fail, if you have an older version of x11-libs/pixman installed (e. g. version 0.34.0). Please update the dependency.
I believe I dropped the last version older than 0.36.0 in commit a43bd8b4a716e7d5196333617b6d817b11b17fed Author: Matt Turner <mattst88@gentoo.org> Date: Thu Jan 31 10:10:38 2019 -0800 x11-libs/pixman: Drop old versions Signed-off-by: Matt Turner <mattst88@gentoo.org> x11-libs/pixman/Manifest | 1 - x11-libs/pixman/pixman-0.34.0.ebuild | 30 ------------------------------ 2 files changed, 31 deletions(-) nearly two years ago. You should update your system a little more often, especially if you're going to use -9999 ebuilds :)
The bug has been closed via the following commit(s): https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=383656ae55a9f310a1721e6a7a5bc0717cbd5be0 commit 383656ae55a9f310a1721e6a7a5bc0717cbd5be0 Author: Matt Turner <mattst88@gentoo.org> AuthorDate: 2020-12-21 18:59:18 +0000 Commit: Matt Turner <mattst88@gentoo.org> CommitDate: 2020-12-21 19:00:03 +0000 x11-libs/cairo: Raise pixman version requirement Raised upstream in commit a34cb719cd9c (Add support for RGBA128F and RGB96F formats.) Closes: https://bugs.gentoo.org/760878 Signed-off-by: Matt Turner <mattst88@gentoo.org> x11-libs/cairo/cairo-9999.ebuild | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)