Otherwise struct ptrace_peeksiginfo_args is redefined.

--- process.c.orig	2014-01-08 18:07:14.306950549 +0100
+++ process.c	2014-01-08 18:07:19.585917125 +0100
@@ -63,7 +63,7 @@
 # ifdef HAVE_STRUCT_PT_ALL_USER_REGS
 #  define pt_all_user_regs XXX_pt_all_user_regs
 # endif
-# include <linux/ptrace.h>
+# include <sys/ptrace.h>
 # undef ia64_fpreg
 # undef pt_all_user_regs
 #endif