Index: sys/arch/aarch64/include/reg.h
===================================================================
RCS file: /cvsroot/src/sys/arch/aarch64/include/reg.h,v
retrieving revision 1.2
diff -u -r1.2 reg.h
--- sys/arch/aarch64/include/reg.h	1 Apr 2018 04:35:03 -0000	1.2
+++ sys/arch/aarch64/include/reg.h	17 Jul 2018 08:45:47 -0000
@@ -44,14 +44,16 @@
 
 union fpelem {
 	uint64_t u64[2];
-	__uint128_t u128[1] __aligned(16);
+#ifdef __SIZEOF_INT128__
+	__uint128_t u128[1];
+#endif
 };
 
 struct fpreg {
 	union fpelem fp_reg[32];
 	uint32_t fpcr;
 	uint32_t fpsr;
-};
+} __aligned(16);
 
 #elif defined(__arm__)