From 01c0a81b4d56786edb1eb169fff84ea51be09fde Mon Sep 17 00:00:00 2001
From: Lei Wang <bestwanglei@gmail.com>
Date: Tue, 22 May 2018 17:05:29 -0700
Subject: [PATCH] Dockerfile: add --allow-downgrades option when install
 libnccl. (#10850)

---
 paddle/scripts/paddle_build.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/paddle/scripts/paddle_build.sh b/paddle/scripts/paddle_build.sh
index b2d22956b5..8d8cfec4ca 100755
--- a/paddle/scripts/paddle_build.sh
+++ b/paddle/scripts/paddle_build.sh
@@ -433,7 +433,7 @@ EOF
 EOF
 
     if [[ ${WITH_GPU} == "ON"  ]]; then
-        NCCL_DEPS="apt-get install -y libnccl2=2.1.2-1+cuda${CUDA_MAJOR} libnccl-dev=2.1.2-1+cuda${CUDA_MAJOR} &&"
+        NCCL_DEPS="apt-get install -y --allow-downgrades libnccl2=2.1.2-1+cuda${CUDA_MAJOR} libnccl-dev=2.1.2-1+cuda${CUDA_MAJOR} &&"
     else
         NCCL_DEPS=""
     fi
-- 
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