no more stderr

install.sh

@@ -2,7 +2,6 @@
 
 ## CONSTANTS
 
-MIAOU_BASH_DIR=/opt/miaou-bash
 MAIN_TAR_GZ_URL="https://git.artcode.re/miaou/miaou-bash/archive/main.tar.gz"
 
 ## FUNCTIONS
@@ -27,7 +26,11 @@ deployment_type_adjective="${1:-installed}"
 [[ "$UID" -ne 0 ]] && echo 'root privilege required' && exit 1
 ! assert_supported_distro && echo 'unsupported distro: debian-like OR arch-like expected' && exit 2
 
-export MIAOU_BASH_DIR
+if [[ ! -v MIAOU_BASH_DIR ]]; then
+  MIAOU_BASH_DIR=/opt/miaou-bash
+  export MIAOU_BASH_DIR
+fi
+
 if [[ -d "$MIAOU_BASH_DIR" && -L /etc/inputrc && "$(readlink /etc/inputrc)" == "$MIAOU_BASH_DIR"/etc/inputrc ]]; then
   . "$MIAOU_BASH_DIR"/bin/miaou-bash "$MIAOU_BASH_DIR/lib/self-upgrade.bash"
 else