From e2e51d7a39847d2c3dc6a3149a5e201d57487a37 Mon Sep 17 00:00:00 2001
From: Daniele Varrazzo <daniele.varrazzo@gmail.com>
Date: Sun, 5 Jan 2025 21:51:57 +0100
Subject: [PATCH] fix(macos): don't crash on undefined variable

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

diff --git a/scripts/build/build_libpq.sh b/scripts/build/build_libpq.sh
index 0baf37bed..6907a8455 100755
--- a/scripts/build/build_libpq.sh
+++ b/scripts/build/build_libpq.sh
@@ -62,7 +62,7 @@ case "$ID" in
         # openssl no matter what so remove it. Since homebrew's curl depends on
         # it, force use of system curl.
         brew uninstall --force --ignore-dependencies openssl gettext curl
-        if [ -z "$MACOSX_ARCHITECTURE" ]; then
+        if [ -z "${MACOSX_ARCHITECTURE:-}" ]; then
             MACOSX_ARCHITECTURE="$(uname -m)"
         fi
         # Set the deployment target to be <= to that of the oldest supported Python version.