diff --git a/build-tools/build-docker-images/build-stx-base.sh b/build-tools/build-docker-images/build-stx-base.sh
index ebfddb8c..8d447484 100755
--- a/build-tools/build-docker-images/build-stx-base.sh
+++ b/build-tools/build-docker-images/build-stx-base.sh
@@ -1,6 +1,6 @@
 #!/bin/bash
 #
-# Copyright (c) 2018-2019 Wind River Systems, Inc.
+# Copyright (c) 2018-2023 Wind River Systems, Inc.
 #
 # SPDX-License-Identifier: Apache-2.0
 #
@@ -10,6 +10,7 @@
 MY_SCRIPT_DIR=$(dirname $(readlink -f $0))
 
 source ${MY_SCRIPT_DIR}/../utils.sh
+source ${MY_SCRIPT_DIR}/../git-utils.sh
 
 # Required env vars
 if [ -z "${MY_WORKSPACE}" -o -z "${MY_REPO}" ]; then
@@ -356,6 +357,7 @@ else
             -e "s!@DEBIAN_DISTRIBUTION@!${DEBIAN_DISTRIBUTION}!g" \
             -e "s!@REPOMGR_DEPLOY_URL@!${REPOMGR_DEPLOY_URL}!g" \
             -e "s!@REPOMGR_ORIGIN@!${REPOMGR_ORIGIN}!g" \
+            -e "s!@LAYER@!${LAYER}!g" \
             "$@"
     }
 
@@ -365,6 +367,22 @@ else
     # debian.sources.list
     replace_vars "${SRC_DOCKER_DIR}/apt/debian.sources.list.in" >"${BUILDDIR}/apt/debian.sources.list"
 
+    # <layer>.sources.list
+    # These can be optionally used if it is necessary to build an image that
+    # requires dependencies that are in repositories not listed in
+    # `stx.sources.list`.
+    layer_cfg_name="${OS}_build_layer.cfg"
+    layer_cfgs=($(find ${GIT_LIST} -maxdepth 1 -name ${layer_cfg_name}))
+    LAYERS=($(
+      for layer_cfg in "${layer_cfgs[@]}"; do
+        echo $(cat "${layer_cfg}")
+      done | sort --unique
+    ))
+
+    for LAYER in "${LAYERS[@]}"; do
+        replace_vars "${SRC_DOCKER_DIR}/apt/layer.sources.list.in" >"${BUILDDIR}/apt/${LAYER}.layer.sources.list"
+    done
+
     # stx.sources: if user provided any --repo's use them instead of the template
     if [[ "${#REPO_LIST[@]}" -gt 0 ]] ; then
         rm -f "${BUILDDIR}/apt/stx.sources.list"
diff --git a/build-tools/build-docker-images/stx-debian/Dockerfile.stable b/build-tools/build-docker-images/stx-debian/Dockerfile.stable
index 8c11a0b1..f9814e94 100644
--- a/build-tools/build-docker-images/stx-debian/Dockerfile.stable
+++ b/build-tools/build-docker-images/stx-debian/Dockerfile.stable
@@ -18,6 +18,15 @@ COPY apt/debian.sources.list /etc/apt/sources.list.d/debian.list.disabled
 COPY apt/stx.sources.list /etc/apt/sources.list.d/stx.list.disabled
 COPY apt/stx.preferences /etc/apt/preferences.d/stx
 
+# Install layer-specific binary repositories.
+# Note: They are all supposed to be disabled by default, but can be optionally
+#       enabled if it is necessary to build an image that requires
+#       dependencies that are in repositories not listed in `stx.sources.list`.
+COPY apt/*.layer.sources.list /etc/apt/sources.list.d/
+RUN for layer in /etc/apt/sources.list.d/*.layer.sources.list; do \
+      mv "${layer}" "$(echo "${layer}" | sed s/.layer.sources.list/.list.disabled/)"; \
+    done
+
 # repo templates:
 #   /etc/apt/sources.list.d/
 #     debian.list.disabled         - vanilla debian repos
diff --git a/build-tools/build-docker-images/stx-debian/apt/layer.sources.list.in b/build-tools/build-docker-images/stx-debian/apt/layer.sources.list.in
new file mode 100644
index 00000000..23adb872
--- /dev/null
+++ b/build-tools/build-docker-images/stx-debian/apt/layer.sources.list.in
@@ -0,0 +1 @@
+deb [trusted=yes] @REPOMGR_DEPLOY_URL@/deb-local-binary-@LAYER@ @DEBIAN_DISTRIBUTION@ main