diff --git a/stx/lib/stx/stx_build.py b/stx/lib/stx/stx_build.py
index a66064209..345ac410b 100644
--- a/stx/lib/stx/stx_build.py
+++ b/stx/lib/stx/stx_build.py
@@ -60,6 +60,12 @@ be [ rt|std ]')
         cmd = prefixcmd + '". /usr/local/bin/stx/stx-cleanup"\''
         return cmd
 
+    def buildDebdownloaderCMD(self, prefixcmd):
+
+        cmd = prefixcmd + '"debdownloader ' + \
+            '$STX_BINARYLIST_DIR/common/base-bullseye.lst"\''
+        return cmd
+
     def buildPackageCMD(self, args, prefixcmd):
 
         if args.force:
@@ -116,6 +122,10 @@ the setup step before building')
             cmd = self.buildCleanupCMD(prefix_cmd)
             self.logger.debug('Execute the cleanup command: [%s].', cmd)
 
+        elif args.build_task == 'debdownloader':
+            cmd = self.buildDebdownloaderCMD(prefix_cmd)
+            self.logger.debug('Execute the debdownloader command: [%s].', cmd)
+
         else:
             cmd = self.buildPackageCMD(args, prefix_cmd)
             self.logger.debug('Compile the package: [%s] with the command \
diff --git a/stx/toCOPY/builder/buildrc b/stx/toCOPY/builder/buildrc
index 153589f6f..a65555490 100644
--- a/stx/toCOPY/builder/buildrc
+++ b/stx/toCOPY/builder/buildrc
@@ -30,6 +30,8 @@ export MY_REPO=$MY_REPO_ROOT_DIR/cgcs-root
 export MY_BUILD_TOOLS_DIR=$MY_REPO/build-tools
 export LAYER=$LAYER
 export STX_CONFIG_DIR=$MY_REPO_ROOT_DIR/stx-tools
+export PREFIX_BINARYLIST_DIR=debian-mirror-tools/config/debian/
+export STX_BINARYLIST_DIR=$STX_CONFIG_DIR/$PREFIX_BINARYLIST_DIR
 export STX_GIT_SRC_DIR=$MY_REPO/stx/git
 
 export PATH=$PATH:$MY_BUILD_TOOLS_DIR/stx:/opt/LAT/lat