--- libtorrent-0.16.25.orig/scripts/common.m4	2026-10-18 07:32:26.788201792 +0200
+++ libtorrent-0.16.25/scripts/common.m4	2026-10-18 07:32:26.798829256 +0200
@@ -126,6 +126,10 @@ AC_DEFUN([TORRENT_CHECK_CACHELINE], [
             AC_MSG_RESULT([linux fallback LoongArch 64 bytes])
             AC_DEFINE([LT_SMP_CACHE_BYTES], 64, [Fallback 64-byte alignment for Linux LoongArch hardware.])
             ;;
+          alpha*)
+            AC_MSG_RESULT([linux fallback Alpha 64 bytes])
+            AC_DEFINE([LT_SMP_CACHE_BYTES], 64, [Fallback 64-byte alignment for Linux Alpha hardware.])
+            ;;
           *)
             AC_MSG_RESULT([unrecognized CPU arch on Linux header fallback])
             AC_MSG_FAILURE([Unrecognized CPU architecture ($host_cpu) on Linux fallback path. Aborting build.])