#include <sys/types.h>
#include <sys/uio.h>
+#include <fcntl.h>
#include <libunwind.h>
#include <libunwind-ptrace.h>
pid_t pid = _UPT_getpid(arg);
size_t size = sizeof(unw_word_t);
-#ifdef HAVE_PROCESS_VM_READV
+#if HAVE_PROCESS_VM_READV
// process_vm_read implementation.
// This is only available since Linux 3.2.