diff -Naur dev86-0.16.18/ld/x86_aout.h dev86-0.16.18.new/ld/x86_aout.h
--- dev86-0.16.18/ld/x86_aout.h	2003-01-28 23:17:14.000000000 +0100
+++ dev86-0.16.18.new/ld/x86_aout.h	2012-05-30 10:09:03.000000000 +0200
@@ -12,6 +12,9 @@
 #if defined(i386) || defined(__BCC__) || defined(MSDOS)
 typedef long Long;
 #define __OUT_OK 1
+#elif defined(__x86_64__)
+typedef int Long;
+#define __OUT_OK 1
 #else
 typedef char Long[4];
 #endif