diff --git a/build/toolchain/musl-host-gcc/sysroot.bzl b/build/toolchain/musl-host-gcc/sysroot.bzl
new file mode 100644
index 0000000..2f54ced
--- /dev/null
+++ b/build/toolchain/musl-host-gcc/sysroot.bzl
@@ -0,0 +1,26 @@
+#  Copyright 2020 The Monogon Project Authors.
+#
+#  SPDX-License-Identifier: Apache-2.0
+#
+#  Licensed under the Apache License, Version 2.0 (the "License");
+#  you may not use this file except in compliance with the License.
+#  You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+#  Unless required by applicable law or agreed to in writing, software
+#  distributed under the License is distributed on an "AS IS" BASIS,
+#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#  See the License for the specific language governing permissions and
+#  limitations under the License.
+
+load("//build/toolchain/musl-host-gcc:sysroot_repository.bzl", "musl_sysroot_rule")
+
+def musl_sysroot_repositories():
+    """
+    Provides an external repository that contains the extracted musl/linux sysroot.
+    """
+    musl_sysroot_rule(
+        name = "musl_sysroot",
+        snapshot = "//build/toolchain/musl-host-gcc:sysroot.tar.xz",
+    )