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diff --git a/include/gambit.h.in b/include/gambit.h.in
index 71e712a7..f8eeb2ea 100644
--- a/include/gambit.h.in
+++ b/include/gambit.h.in
@@ -443,11 +443,27 @@
#endif
#endif
+#ifndef ___CPU_s390
+
+#ifdef __s390__
+#define ___CPU_s390
+#else
+#ifdef __s390x__
+#define ___CPU_s390
+#else
+#ifdef __zarch__
+#define ___CPU_s390
+#endif
+#endif
+#endif
+
+#endif
+
/*
* Determine the byte order endianness based on the processor type.
- * We assume that all processors are little-endian, except the sparc and
- * m68k. The PowerPC, MIPS, ARM and Itanium can be either big-endian or
- * little-endian so extra tests are needed.
+ * We assume that all processors are little-endian, except the sparc,
+ * m68k, and s390. The PowerPC, MIPS, ARM and Itanium can be either
+ * big-endian or little-endian so extra tests are needed.
*/
#ifndef ___BIG_ENDIAN
@@ -484,6 +500,10 @@
#define ___BIG_ENDIAN
#endif
+#ifdef ___CPU_s390
+#define ___BIG_ENDIAN
+#endif
+
#ifdef ___CPU_mips
#ifdef _MIPSEL
#define ___LITTLE_ENDIAN
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