[CRIU] [PATCH 09/10] Documentation: Add a hint about docker build

[Dmitry Safonov]

The original/old guide probably doesn't work anymore:
- the patch isn't accessible;
- criu now depends on more libraries not only protobuf

Still, keep it as it might be helpful for someone.

Signed-off-by: Dmitry Safonov <dima at arista.com>
---
 Documentation/HOWTO.cross-compile | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/Documentation/HOWTO.cross-compile b/Documentation/HOWTO.cross-compile
index f1b17842b878..44b19dfea855 100644
--- a/Documentation/HOWTO.cross-compile
+++ b/Documentation/HOWTO.cross-compile
@@ -1,4 +1,10 @@
-This HOWTO explains how to cross-compile CRIU on x86
+How to cross-compile CRIU on x86:
+
+Use the Dockerfile provided:
+   scripts/build/Dockerfile.armv7-cross
+
+Historical guide how-to do it without docker container:
+[Unsupported, may not work anymore!]
 
  1. Download the protobuf sources.
  2. Apply the patch http://16918.selcdn.ru/crtools/aarch64/0001-protobuf-added-the-support-for-the-acrchitecture-AAr.patch
-- 
2.24.0