I tried rebuilding the EL9 package on RHEL10 and it worked fine. It appears the epel10 packaging branch isn't yet created (edited see comment#1). I need it for a few things, and I noticed it was missing when I was testing out an upgrade to RHEL10 beta.
Sorry, typo should be "It appears the packaging branch isn't already available", or maybe better said "It appears the epel10 packaging branch isn't yet created"
FEDORA-EPEL-2024-3f4ff48307 (nanomsg-1.2.1-1.el10_0) has been submitted as an update to Fedora EPEL 10.0. https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2024-3f4ff48307
FEDORA-EPEL-2024-3f4ff48307 has been pushed to the Fedora EPEL 10.0 testing repository. You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2024-3f4ff48307 See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.
FEDORA-EPEL-2024-3f4ff48307 (nanomsg-1.2.1-1.el10_0) has been pushed to the Fedora EPEL 10.0 stable repository. If problem still persists, please make note of it in this bug report.