Add qt install location

Need to set an environmental variable so Qt6 can be found when the gui is built.

Author: rbnpi

app/pi-build-gui.sh

@@ -3,7 +3,7 @@ set -e # Quit script on error
 SCRIPT_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
 WORKING_DIR="$(pwd)"
 
-"${SCRIPT_DIR}"/linux-build-gui.sh "$@"
+QT_INSTALL_LOCATION=/usr/lib/qt6 "${SCRIPT_DIR}"/linux-build-gui.sh "$@"
 
 # Restore working directory as it was prior to this script running...
 cd "${WORKING_DIR}"