This is an auto-filed bug because x11-misc/xaos calls ar directly.
The issue was originally discovered on amd64, but it may be reproducible on other arches as well.
If you think that a different summary clarifies the issue better, feel free to change it.
Attached build log and emerge --info.
If you think it doesn't make sense fix these type of issues, I'd like to point out that won't be possible use a different AR implementation (like llvm-ar) by setting the AR variable. So this issue has been reproduced by setting the AR variable to x86_64-pc-linux-gnu-ar and by removing the /usr/bin/ar binary.
Created attachment 642680 [details]
build log and emerge --info
The bug has been closed via the following commit(s):
Author: David Seifert <firstname.lastname@example.org>
AuthorDate: 2021-03-20 11:11:37 +0000
Commit: David Seifert <email@example.com>
CommitDate: 2021-03-20 11:11:37 +0000
x11-misc/xaos: Port to EAPI 7
Package-Manager: Portage-3.0.17, Repoman-3.0.2
Signed-off-by: David Seifert <firstname.lastname@example.org>
x11-misc/xaos/files/xaos-3.4-include.patch | 4 +-
x11-misc/xaos/files/xaos-3.4-png.patch | 11 ---
x11-misc/xaos/files/xaos-3.6-buildsystem.patch | 86 +++++++++++++++++++++
x11-misc/xaos/files/xaos-3.6-locale-dir.patch | 11 ---
x11-misc/xaos/files/xaos-3.6-no-auto-strip.patch | 20 -----
x11-misc/xaos/xaos-3.6.ebuild | 96 ++++++++++++------------
6 files changed, 134 insertions(+), 94 deletions(-)