v2.1.0 fails to cross-compile for all five linux targets in the xgo container (C.RTLD_NEXT unresolvable without _GNU_SOURCE), so the v2.5.3 release shipped darwin pam plugins only. v1.2.0 cross-compiles cleanly with an identical API surface for this plugin. Claude-Session: https://claude.ai/code/session_014L5EoqGWsuZWr8fCVM6izP Co-authored-by: Claude Opus 5 (1M context) <noreply@anthropic.com>