This is an auto-filed bug because sci-astronomy/xfitsview 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 641696 [details]
build log and emerge --info
The bug has been closed via the following commit(s):
Author: David Seifert <email@example.com>
AuthorDate: 2021-05-09 19:18:17 +0000
Commit: David Seifert <firstname.lastname@example.org>
CommitDate: 2021-05-09 19:18:17 +0000
sci-astronomy/xfitsview: Respect AR
Package-Manager: Portage-3.0.18, Repoman-3.0.3
Signed-off-by: David Seifert <email@example.com>
.../xfitsview/files/xfitsview-2.2-build_system.patch | 15 ++++++++++++++-
sci-astronomy/xfitsview/xfitsview-2.2-r2.ebuild | 20 ++++++++++++--------
2 files changed, 26 insertions(+), 9 deletions(-)