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[Xen-devel] [PATCH] automation: document vsyscall=emulate for old glibc

Signed-off-by: Wei Liu <wl@xxxxxxx>
 automation/build/README.md | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/automation/build/README.md b/automation/build/README.md
index 476f82cf45..8cda2b65a5 100644
--- a/automation/build/README.md
+++ b/automation/build/README.md
@@ -58,6 +58,16 @@ understands.
 - XEN_CONFIG_EXPERT: If this is defined in your shell it will be
   automatically passed through to the container.
+If your docker host has Linux kernel > 4.11, and you want to use containers
+that run old glibc (for example, CentOS 6 or SLES11SP4), you may need to add
+to the host kernel command line. That enables a legacy interface that is used
+by old glibc.
 Building a container

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