From 3039080e19cb7a96c7c7ffa8c7c040a9bbc63271 Mon Sep 17 00:00:00 2001
From: Paul Colby <git@colby.id.au>
Date: Sun, 9 Apr 2023 13:16:25 +1000
Subject: [PATCH] Use `[[` instead of `[`

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

diff --git a/build.sh b/build.sh
index 0317de9..d9f9a00 100755
--- a/build.sh
+++ b/build.sh
@@ -28,7 +28,7 @@ function require {
   for c in "$@"; do
     local V="${c//[^[:word:]]/_}"
     V="$(tr '[:lower:]' '[:upper:]' <<< "$V")" # For macOS's old Bash only.
-    if [ -v "$V" ]; then continue; fi
+    if [[ -v "$V" ]]; then continue; fi
     C=$(command -v "$c") || { echo "Required command not found: $c" >&2; exit 1; }
     eval "$V"="$C"
   done