--- wikisrc/users/leot/aarch64_problems.mdwn	2018/07/23 21:25:42	1.5
+++ wikisrc/users/leot/aarch64_problems.mdwn	2018/07/23 22:51:09	1.7
@@ -121,3 +121,29 @@ Doing a (please note that also `python36
     fpsr           0x3000000        50331648
     fpcr           0x10     16
     (gdb) quit
+
+...and `_cffi_restore_errno` and `_cffi_save_errno` are defined in
+`cffi/_cffi_include.h` as follows:
+
+    #define _cffi_restore_errno                                              \
+        ((void(*)(void))_cffi_exports[13])
+    #define _cffi_save_errno                                                 \
+        ((void(*)(void))_cffi_exports[14])
+
+The following patch workaround the issue:
+
+    $NetBSD$
+    
+    Kludge for NetBSD/aarch64 SIGILL.
+    
+    --- setup.py.orig	2018-02-27 18:15:41.000000000 +0000
+    +++ setup.py
+    @@ -70,7 +70,7 @@ def ask_supports_thread():
+         ok = (sys.platform != 'win32' and
+               config.try_compile('__thread int some_threadlocal_variable_42;'))
+         if ok:
+    -        define_macros.append(('USE__THREAD', None))
+    +        pass
+         else:
+             ok1 = config.try_compile('int some_regular_variable_42;')
+             if not ok1: