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diff --git a/src/lisp.h b/src/lisp.h
--- a/src/lisp.h
+++ b/src/lisp.h
@@ -1154,6 +1154,8 @@
/* ------------------------ alignment definitions ------------------- */
+#if (!defined (__STDC_VERSION__) || __STDC_VERSION__ < 201112L) && \
+ (!defined (__cplusplus) || __cplusplus < 201103L)
/* No type has a greater alignment requirement than max_align_t.
(except perhaps for types we don't use, like long double) */
typedef union
@@ -1163,6 +1165,7 @@
struct { void (*f)(void); } f;
struct { double d; } d;
} max_align_t;
+#endif
/* ALIGNOF returns the required alignment of a type -- i.e. a value such
that data of this type must begin at a memory address which is a
@@ -1170,7 +1173,11 @@
as the type itself. */
#ifndef ALIGNOF
-# if defined (__GNUC__) && (__GNUC__ >= 2)
+# if defined (__STDC_VERSION__) && __STDC_VERSION__ >= 201112L
+# define ALIGNOF(type) _Alignof(type)
+# elif defined (__cplusplus) && __cplusplus >= 201103L
+# define ALIGNOF(type) alignof(type)
+# elif defined (__GNUC__) && (__GNUC__ >= 2)
/* gcc has an extension that gives us exactly what we want. */
# define ALIGNOF(type) __alignof__ (type)
# elif ! defined (__cplusplus)
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