diff -Naur acpica-unix2-20160831/source/include/platform/aclinux.h acpica-unix2-20160831-s390x/source/include/platform/aclinux.h
--- acpica-unix2-20160831/source/include/platform/aclinux.h	2016-09-01 15:18:36.306268594 -0600
+++ acpica-unix2-20160831-s390x/source/include/platform/aclinux.h	2016-09-01 16:01:34.955157827 -0600
@@ -194,7 +194,8 @@
 #define ACPI_CAST_PTHREAD_T(Pthread) ((ACPI_THREAD_ID) (Pthread))
 
 #if defined(__ia64__)    || defined(__x86_64__) ||\
-    defined(__aarch64__) || defined(__PPC64__)
+    defined(__aarch64__) || defined(__PPC64__)  ||\
+    defined(__s390x__)
 #define ACPI_MACHINE_WIDTH          64
 #define COMPILER_DEPENDENT_INT64    long
 #define COMPILER_DEPENDENT_UINT64   unsigned long