--- strace-4.9.orig/defs.h
+++ strace-4.9/defs.h
@@ -159,6 +159,10 @@
 # include <sys/ptrace.h>
 #endif
 
+#if defined(ARM)
+# include <asm/ptrace.h>
+#endif
+
 #if defined(POWERPC)
 # include <asm/ptrace.h>
 #endif