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-rw-r--r--pkgs/development/tools/xcbuild/setup-hook.sh2
1 files changed, 1 insertions, 1 deletions
diff --git a/pkgs/development/tools/xcbuild/setup-hook.sh b/pkgs/development/tools/xcbuild/setup-hook.sh
index 9dc03a61f62..f4b5abf2d8d 100644
--- a/pkgs/development/tools/xcbuild/setup-hook.sh
+++ b/pkgs/development/tools/xcbuild/setup-hook.sh
@@ -20,7 +20,7 @@ xcbuildInstallPhase () {
 }
 
 buildPhase=xcbuildBuildPhase
-if [ -z "$installPhase" ]; then
+if [ -z "${installPhase-}" ]; then
     installPhase=xcbuildInstallPhase
 fi