--- sandbox-2.6.orig/configure.ac	2012-07-03 21:43:15.000000000 +0200
+++ sandbox-2.6.orig/configure.ac	2013-10-01 10:29:55.720113237 +0200
@@ -108,9 +108,12 @@ 
 	sys/user.h
 	sys/wait.h
 	asm/ptrace.h
-	linux/ptrace.h
 ]))
 
+if test "$HAVE_LINUX_PTRACE_H" = ""; then
+	AC_CHECK_HEADER([linux/ptrace.h])
+fi
+
 dnl Checks for typedefs, structures, and compiler characteristics.
 dnl Do this after all headers have been checked.
 AC_C_CONST