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-rw-r--r--include/aout/aout64.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/aout/aout64.h b/include/aout/aout64.h
index a85a801..dbe25ef 100644
--- a/include/aout/aout64.h
+++ b/include/aout/aout64.h
@@ -43,7 +43,7 @@ struct external_exec
/* Magic numbers for a.out files. */
-#if ARCH_SIZE==64
+#if defined(ARCH_SIZE) && ARCH_SIZE == 64
#define OMAGIC 0x1001 /* Code indicating object file. */
#define ZMAGIC 0x1002 /* Code indicating demand-paged executable. */
#define NMAGIC 0x1003 /* Code indicating pure executable. */