From a7c29c9d17e8420d6fd222ce7a9ee481b29dad37 Mon Sep 17 00:00:00 2001
From: Andrey Talman <atalman@fb.com>
Date: Thu, 27 Jun 2024 13:00:28 -0400
Subject: [PATCH] Fix crash when PYTORCH_VERSION is not defined

---
 packaging/pre_build_script.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/packaging/pre_build_script.sh b/packaging/pre_build_script.sh
index 1690c62750..cbc065bf11 100644
--- a/packaging/pre_build_script.sh
+++ b/packaging/pre_build_script.sh
@@ -10,7 +10,7 @@ set -eux
 echo "This script is run before building torchao binaries"
 
 python -m pip install --upgrade pip
-if [ -z "$PYTORCH_VERSION" ]; then
+if [ -z ${PYTORCH_VERSION:-} ]; then
     PYTORCH_DEP="torch"
 else
     PYTORCH_DEP="torch==$PYTORCH_VERSION"