--- libcpp/lex.c	2020-01-12 11:54:38.565380941 +0100
+++ libcpp/lex.c	2020-01-21 14:35:36.182794214 +0100
@@ -752,7 +752,7 @@ search_line_fast (const uchar *s, const
   }
 }
 
-#elif defined (__ARM_NEON) && defined (__ARM_64BIT_STATE)
+#elif defined (__ARM_NEON) && defined (__ARM_64BIT_STATE) && __has_include("arm_bf16.h")
 #include "arm_neon.h"
 
 /* This doesn't have to be the exact page size, but no system may use
@@ -847,7 +847,7 @@ done:
 	  + __builtin_ctz (found));
 }
 
-#elif defined (__ARM_NEON)
+#elif defined (__ARM_NEON) && __has_include("arm_bf16.h")
 #include "arm_neon.h"
 
 static const uchar *