diff -bur ucl-1.03-orig/acc/acc_arch.h ucl-1.03/acc/acc_arch.h
--- ucl-1.03-orig/acc/acc_arch.h	2025-02-25 05:25:26 -0700
+++ ucl-1.03/acc/acc_arch.h	2025-02-25 05:37:23 -0700
@@ -74,6 +74,9 @@
 #  error "missing define for CPU architecture"
 #elif (ACC_OS_WIN64)
 /* #  error "missing define for CPU architecture" */
+  #if defined(__aarch64__) || defined(_M_ARM64)
+  #  define ACC_INFO_ARCH             "arm64"
+  #endif
 #elif (ACC_OS_TOS) || defined(__m68000__)
 #  define ACC_ARCH_M68K             1
 #  define ACC_INFO_ARCH             "m68k"
