This is an auto-filed bug because games-puzzle/mures 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 640878 [details]
build log and emerge --info
The bug has been closed via the following commit(s):
Author: David Seifert <firstname.lastname@example.org>
AuthorDate: 2020-06-21 19:59:19 +0000
Commit: David Seifert <email@example.com>
CommitDate: 2020-06-21 19:59:19 +0000
games-puzzle/mures: [QA] Run AM_PROG_AR
Package-Manager: Portage-2.3.101, Repoman-2.3.22
Signed-off-by: David Seifert <firstname.lastname@example.org>
games-puzzle/mures/files/mures-0.5-underlink.patch | 14 ++++++++++++--
games-puzzle/mures/mures-0.5-r1.ebuild | 21 +++++++++++++--------
2 files changed, 25 insertions(+), 10 deletions(-)