diff --git a/scripts/git-prompt-install.sh b/scripts/git-prompt-install.sh
index 076a556..76374be 100755
--- a/scripts/git-prompt-install.sh
+++ b/scripts/git-prompt-install.sh
@@ -1,7 +1,9 @@
 #!/bin/bash
 
+set -E -o errexit -o nounset -o pipefail
 set -x
-set -u
+
+GIT_PROMPT_PATH=${GIT_PROMPT_PATH:-$LWS/opt/bash-git-prompt}
 
 readonly REPO="https://github.com/magicmonty/bash-git-prompt.git"