diff --git a/app/.Makefile.scripts/Makefile.android-sdk.sh b/app/.Makefile.scripts/Makefile.android-sdk.sh
index 6d0eb52..d46b5d3 100755
--- a/app/.Makefile.scripts/Makefile.android-sdk.sh
+++ b/app/.Makefile.scripts/Makefile.android-sdk.sh
@@ -1,15 +1,20 @@
 #!/bin/bash
 
 set -x
-. app-config.sh
 
-type sdkmanager 2>/dev/null || {
+# get configuration
+source app-config.sh
+
+
+# in case needed download and install `sdkmanager`
+type sdkmanager 2>/dev/null || (
   BUILD_TOOLS="$(realpath -m "$BUILD_TOOLS_LATEST/..")"
   mkdir -p "$BUILD_TOOLS"
   cd "$BUILD_TOOLS"
   for LATESTTOOLS in \
-    "$(curl https://developer.android.com/studio#command-line-tools-only | grep -e 'https://dl.google.com/android/repository/commandlinetools-linux-.*_latest.zip' | cut -f2 -d'"')" \
-    'https://dl.google.com/android/repository/commandlinetools-linux-11076708_latest.zip' ;\
+    "$(curl 'https://developer.android.com/studio#command-line-tools-only' | 
+      grep -e 'https://dl.google.com/android/repository/commandlinetools-linux-.*_latest.zip' | cut -f2 -d'"')" \
+    'https://dl.google.com/android/repository/commandlinetools-linux-11076708_latest.zip'
   do 
     echo "testing to get '$LATESTTOOLS'"
     echo test "${LATESTTOOLS:0:22}" = "https://dl.google.com/" -a "${LATESTTOOLS:(-11)}" = "_latest.zip" 
@@ -22,12 +27,12 @@ type sdkmanager 2>/dev/null || {
       echo "error downloading working cmdline-tools.zip"
       exit 1
     }
-  done;\
+  done
   ls
   ls cmdline-tools
-  rm cmdline-tools.zip;\
+  rm cmdline-tools.zip
   mv -v cmdline-tools "$BUILD_TOOLS_LATEST" || true
-}
+)
 
 test -f android-sdk/.installed.buildtools.version.$APP_VERSION_SDK_TARGET || {
   EXACTVERSION_BUILDTOOLS="$(