diff --git a/cc/BUILD.bazel b/cc/BUILD.bazel
index 2a91fa8..4383b13 100644
--- a/cc/BUILD.bazel
+++ b/cc/BUILD.bazel
@@ -94,3 +94,15 @@ config_setting(
     flag_values = {":cxx_standard": "23"},
     visibility = ["//visibility:public"],
 )
+
+bool_flag(
+    name = "enable_sysroot",
+    build_setting_default = False,
+    visibility = ["//visibility:public"],
+)
+
+config_setting(
+    name = "_enable_sysroot",
+    flag_values = {":enable_sysroot": "true"},
+    visibility = ["//visibility:public"],
+)
diff --git a/cc/repositories.bzl b/cc/repositories.bzl
index b573358..3684438 100644
--- a/cc/repositories.bzl
+++ b/cc/repositories.bzl
@@ -69,11 +69,27 @@ filegroup(
         url = "https://github.com/swift-nav/swift-toolchains/releases/download/bullseye-aarch64-sysroot-v1/debian_bullseye_aarch64_sysroot.tar.xz",
     )
 
+def x86_64_sysroot():
+    maybe(
+        http_archive,
+        name = "x86_64-sysroot",
+        # sha256 = "9bd27c7ec6aa4bd3d4df60cd04228669bcf366aec32d4b4dc7b504de2f63121e",
+        build_file_content = """
+filegroup(
+    name = "x86_64-sysroot",
+    srcs = glob(["*/**"]),
+    visibility = ["//visibility:public"],
+)
+    """,
+        url = "https://github.com/swift-nav/swift-toolchains/releases/download/bullseye-x86_64-sysroot-v1/debian_bullseye_x86_64_sysroot.tar.xz",
+    )
+
 def register_swift_cc_toolchains():
     native.register_toolchains("@rules_swiftnav//cc/toolchains/llvm/aarch64-darwin:cc-toolchain-aarch64-darwin")
     native.register_toolchains("@rules_swiftnav//cc/toolchains/llvm/x86_64-darwin:cc-toolchain-x86_64-darwin")
     native.register_toolchains("@rules_swiftnav//cc/toolchains/llvm/x86_64-linux:cc-toolchain-x86_64-linux")
     native.register_toolchains("@rules_swiftnav//cc/toolchains/llvm/x86_64-aarch64-linux:cc-toolchain-x86_64-aarch64-linux")
+    native.register_toolchains("@rules_swiftnav//cc/toolchains/llvm/x86_64-darwin-x86_64-linux:cc-toolchain-x86_64-darwin-x86_64-linux")
 
 def aarch64_linux_musl_toolchain():
     http_archive(
diff --git a/cc/toolchains/llvm/cc_toolchain_config.bzl b/cc/toolchains/llvm/cc_toolchain_config.bzl
index 41d9da1..c3b1029 100644
--- a/cc/toolchains/llvm/cc_toolchain_config.bzl
+++ b/cc/toolchains/llvm/cc_toolchain_config.bzl
@@ -35,7 +35,7 @@ def cc_toolchain_config(
     if not is_target_triplet(target_system_name):
         fail(target_system_name + " is not a target tripplet")
 
-    cross_compile = host_system_name != target_system_name
+    use_libstdcpp = builtin_sysroot != None and not is_darwin
 
     # Default compiler flags:
     compile_flags = [
@@ -82,7 +82,7 @@ def cc_toolchain_config(
         # The whole codebase should build with c++14
         "-std=c++14",
         # Use bundled libc++ for hermeticity if not cross compiling
-    ] + ["-stdlib=libstdc++"] if cross_compile else ["-stdlib=libc++"]
+    ] + ["-stdlib=libstdc++"] if use_libstdcpp else ["-stdlib=libc++"]
 
     link_flags = [
         "--target=" + target_system_name,
@@ -124,7 +124,7 @@ def cc_toolchain_config(
             "-ldl",
         ])
 
-        if cross_compile:
+        if use_libstdcpp:
             link_flags.extend([
                 # Use libstdc++ from the sysroot when cross compiling
                 "-l:libstdc++.a",
diff --git a/cc/toolchains/llvm/x86_64-darwin-x86_64-linux/BUILD.bazel b/cc/toolchains/llvm/x86_64-darwin-x86_64-linux/BUILD.bazel
new file mode 100644
index 0000000..9f015e3
--- /dev/null
+++ b/cc/toolchains/llvm/x86_64-darwin-x86_64-linux/BUILD.bazel
@@ -0,0 +1,157 @@
+# Copyright (C) 2022 Swift Navigation Inc.
+# Contact: Swift Navigation <dev@swift-nav.com>
+#
+# This source is subject to the license found in the file 'LICENSE' which must
+# be be distributed together with this source. All other rights reserved.
+#
+# THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND,
+# EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED
+# WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A PARTICULAR PURPOSE.
+
+package(default_visibility = ["//visibility:public"])
+
+load("//cc/toolchains/llvm:cc_toolchain_config.bzl", "cc_toolchain_config")
+load("//cc/toolchains/llvm:target_triplets.bzl", "X86_64_DARWIN", "X86_64_LINUX")
+
+filegroup(
+    name = "wrappers",
+    srcs = glob([
+        "wrappers/**",
+    ]),
+    visibility = ["//visibility:public"],
+)
+
+filegroup(
+    name = "ar_files",
+    srcs = [
+        ":wrappers",
+        "@x86_64-sysroot",
+        "@x86_64-darwin-llvm//:ar",
+    ],
+)
+
+filegroup(
+    name = "as_files",
+    srcs = [
+        ":wrappers",
+        "@x86_64-sysroot",
+        "@x86_64-darwin-llvm//:as",
+    ],
+)
+
+filegroup(
+    name = "compiler_files",
+    srcs = [
+        ":wrappers",
+        "@x86_64-sysroot",
+        "@x86_64-darwin-llvm//:clang",
+        "@x86_64-darwin-llvm//:include",
+    ],
+)
+
+filegroup(
+    name = "dwp_files",
+    srcs = [
+        ":wrappers",
+        "@x86_64-sysroot",
+        "@x86_64-darwin-llvm//:dwp",
+    ],
+)
+
+filegroup(
+    name = "linker_files",
+    srcs = [
+        ":wrappers",
+        "@x86_64-sysroot",
+        "@x86_64-darwin-llvm//:ar",
+        "@x86_64-darwin-llvm//:clang",
+        "@x86_64-darwin-llvm//:ld",
+        "@x86_64-darwin-llvm//:lib",
+    ],
+)
+
+filegroup(
+    name = "objcopy_files",
+    srcs = [
+        ":wrappers",
+        "@x86_64-sysroot",
+        "@x86_64-darwin-llvm//:objcopy",
+    ],
+)
+
+filegroup(
+    name = "strip_files",
+    srcs = [
+        ":wrappers",
+        "@x86_64-darwin-llvm//:strip",
+    ],
+)
+
+filegroup(
+    name = "all_files",
+    srcs = [
+        "linker_files",
+        ":compiler_files",
+        "@x86_64-darwin-llvm//:bin",
+    ],
+)
+
+cc_toolchain_config(
+    name = "local-x86_64-darwin",
+    abi_libc_version = "darwin_x86_64",
+    abi_version = "darwin_x86_64",
+    builtin_sysroot = "external/x86_64-sysroot",
+    compiler = "clang",
+    cxx_builtin_include_directories = [
+        "%sysroot%/usr/include",
+    ],
+    host_system_name = X86_64_DARWIN,
+    is_darwin = False,
+    target_cpu = "k8",
+    target_libc = "glibc_unknown",
+    target_system_name = X86_64_LINUX,
+    tool_paths = {
+        "ar": "wrappers/llvm-ar",
+        "cpp": "wrappers/clang-cpp",
+        "gcc": "wrappers/clang",
+        "gcov": "wrappers/llvm-profdata",
+        "llvm-cov": "wrappers/llvm-cov",
+        "llvm-profdata": "wrappers/llvm-profdata",
+        "ld": "wrappers/ld.ldd",
+        "nm": "wrappers/llvm-nm",
+        "objcopy": "wrappers/llvm-objcopy",
+        "objdump": "wrappers/llvm-objdump",
+        "strip": "wrappers/llvm-strip",
+    },
+    toolchain_identifier = "clang-x86_64-darwin-x86_64-linux",
+    toolchain_path_prefix = "external/x86_64-darwin-llvm",
+)
+
+cc_toolchain(
+    name = "cc-clang-x86_64-darwin-x86_64-linux",
+    all_files = ":all_files",
+    ar_files = ":ar_files",
+    as_files = ":as_files",
+    compiler_files = ":compiler_files",
+    dwp_files = ":dwp_files",
+    linker_files = ":linker_files",
+    objcopy_files = ":objcopy_files",
+    strip_files = ":strip_files",
+    toolchain_config = ":local-x86_64-darwin",
+)
+
+toolchain(
+    name = "cc-toolchain-x86_64-darwin-x86_64-linux",
+    exec_compatible_with = [
+        "@platforms//cpu:x86_64",
+        "@platforms//os:macos",
+    ],
+    target_compatible_with = [
+        "@platforms//cpu:x86_64",
+        "@platforms//os:linux",
+        "//cc/constraints:glibc_2_31",
+    ],
+    target_settings = None,
+    toolchain = ":cc-clang-x86_64-darwin-x86_64-linux",
+    toolchain_type = "@bazel_tools//tools/cpp:toolchain_type",
+)
diff --git a/cc/toolchains/llvm/x86_64-darwin-x86_64-linux/wrappers/clang b/cc/toolchains/llvm/x86_64-darwin-x86_64-linux/wrappers/clang
new file mode 120000
index 0000000..22cb46f
--- /dev/null
+++ b/cc/toolchains/llvm/x86_64-darwin-x86_64-linux/wrappers/clang
@@ -0,0 +1 @@
+wrapper
\ No newline at end of file
diff --git a/cc/toolchains/llvm/x86_64-darwin-x86_64-linux/wrappers/clang-cpp b/cc/toolchains/llvm/x86_64-darwin-x86_64-linux/wrappers/clang-cpp
new file mode 120000
index 0000000..22cb46f
--- /dev/null
+++ b/cc/toolchains/llvm/x86_64-darwin-x86_64-linux/wrappers/clang-cpp
@@ -0,0 +1 @@
+wrapper
\ No newline at end of file
diff --git a/cc/toolchains/llvm/x86_64-darwin-x86_64-linux/wrappers/ld.ldd b/cc/toolchains/llvm/x86_64-darwin-x86_64-linux/wrappers/ld.ldd
new file mode 120000
index 0000000..22cb46f
--- /dev/null
+++ b/cc/toolchains/llvm/x86_64-darwin-x86_64-linux/wrappers/ld.ldd
@@ -0,0 +1 @@
+wrapper
\ No newline at end of file
diff --git a/cc/toolchains/llvm/x86_64-darwin-x86_64-linux/wrappers/llvm-ar b/cc/toolchains/llvm/x86_64-darwin-x86_64-linux/wrappers/llvm-ar
new file mode 120000
index 0000000..22cb46f
--- /dev/null
+++ b/cc/toolchains/llvm/x86_64-darwin-x86_64-linux/wrappers/llvm-ar
@@ -0,0 +1 @@
+wrapper
\ No newline at end of file
diff --git a/cc/toolchains/llvm/x86_64-darwin-x86_64-linux/wrappers/llvm-cov b/cc/toolchains/llvm/x86_64-darwin-x86_64-linux/wrappers/llvm-cov
new file mode 120000
index 0000000..22cb46f
--- /dev/null
+++ b/cc/toolchains/llvm/x86_64-darwin-x86_64-linux/wrappers/llvm-cov
@@ -0,0 +1 @@
+wrapper
\ No newline at end of file
diff --git a/cc/toolchains/llvm/x86_64-darwin-x86_64-linux/wrappers/llvm-nm b/cc/toolchains/llvm/x86_64-darwin-x86_64-linux/wrappers/llvm-nm
new file mode 120000
index 0000000..22cb46f
--- /dev/null
+++ b/cc/toolchains/llvm/x86_64-darwin-x86_64-linux/wrappers/llvm-nm
@@ -0,0 +1 @@
+wrapper
\ No newline at end of file
diff --git a/cc/toolchains/llvm/x86_64-darwin-x86_64-linux/wrappers/llvm-objcopy b/cc/toolchains/llvm/x86_64-darwin-x86_64-linux/wrappers/llvm-objcopy
new file mode 120000
index 0000000..22cb46f
--- /dev/null
+++ b/cc/toolchains/llvm/x86_64-darwin-x86_64-linux/wrappers/llvm-objcopy
@@ -0,0 +1 @@
+wrapper
\ No newline at end of file
diff --git a/cc/toolchains/llvm/x86_64-darwin-x86_64-linux/wrappers/llvm-objdump b/cc/toolchains/llvm/x86_64-darwin-x86_64-linux/wrappers/llvm-objdump
new file mode 120000
index 0000000..22cb46f
--- /dev/null
+++ b/cc/toolchains/llvm/x86_64-darwin-x86_64-linux/wrappers/llvm-objdump
@@ -0,0 +1 @@
+wrapper
\ No newline at end of file
diff --git a/cc/toolchains/llvm/x86_64-darwin-x86_64-linux/wrappers/llvm-profdata b/cc/toolchains/llvm/x86_64-darwin-x86_64-linux/wrappers/llvm-profdata
new file mode 120000
index 0000000..22cb46f
--- /dev/null
+++ b/cc/toolchains/llvm/x86_64-darwin-x86_64-linux/wrappers/llvm-profdata
@@ -0,0 +1 @@
+wrapper
\ No newline at end of file
diff --git a/cc/toolchains/llvm/x86_64-darwin-x86_64-linux/wrappers/llvm-strip b/cc/toolchains/llvm/x86_64-darwin-x86_64-linux/wrappers/llvm-strip
new file mode 120000
index 0000000..22cb46f
--- /dev/null
+++ b/cc/toolchains/llvm/x86_64-darwin-x86_64-linux/wrappers/llvm-strip
@@ -0,0 +1 @@
+wrapper
\ No newline at end of file
diff --git a/cc/toolchains/llvm/x86_64-darwin-x86_64-linux/wrappers/wrapper b/cc/toolchains/llvm/x86_64-darwin-x86_64-linux/wrappers/wrapper
new file mode 100755
index 0000000..e8a60c3
--- /dev/null
+++ b/cc/toolchains/llvm/x86_64-darwin-x86_64-linux/wrappers/wrapper
@@ -0,0 +1,58 @@
+#!/usr/bin/env bash
+
+# Copyright (C) 2022 Swift Navigation Inc.
+# Contact: Swift Navigation <dev@swift-nav.com>
+#
+# This source is subject to the license found in the file 'LICENSE' which must
+# be be distributed together with this source. All other rights reserved.
+#
+# THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND,
+# EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED
+# WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A PARTICULAR PURPOSE.
+
+# Locates the actual tool paths relative to the location this script is 
+# executed from.
+#
+# This is necessary because we download the toolchain using
+# http_archive, which bazel places in _execroot_/external/_repo_name_.
+#
+# Unfortunately we cannot provide this location as the argument of tool_path
+# when configuring the toolchain, because tool_path only takes a relative path.
+#
+# This is the fairly common workaround to handle this.
+#
+# TODO: [BUILD-549] - Remove need for wrapper files
+#
+# Recent versions of Bazel may have introduced a mechanism that removes
+# the need for this workaround: https://github.com/bazelbuild/bazel/issues/7746
+
+set -e
+
+# Use --actionv_env=SWIFTNAV_VERBOSE_TOOLCHAIN to enable
+if [[ -n "$SWIFTNAV_VERBOSE_TOOLCHAIN" ]]; then
+  set -x
+fi
+
+tool_name=$(basename "${BASH_SOURCE[0]}")
+toolchain_bindir=external/x86_64-darwin-llvm/bin
+
+if [[ -f "${toolchain_bindir}"/"${tool_name}" ]]; then
+  # We're running under _execroot_, call the real tool.
+  exec "${toolchain_bindir}"/"${tool_name}" "$@"
+elif [[ "${BASH_SOURCE[0]}" == "/"* ]]; then
+  # This branch exists because some users of the toolchain,
+  # namely rules_foreign_cc, will change CWD and call $CC (this script)
+  # with its absolute path.
+  #
+  # To deal with this we find the tool relative to this script, which is at
+  # _execroot_/external/rules_swiftnav/cc/toolchain/llvm/x86_64-linux/wrappers/wrapper.
+  #
+  # If the wrapper is relocated then this line needs to be adjusted.
+  execroot_path="${BASH_SOURCE[0]%/*/*/*/*/*/*/*/*}"
+  tool="${execroot_path}/${toolchain_bindir}/${tool_name}"
+  exec "${tool}" "${@}"
+else
+  >&2 echo "ERROR: could not find ${tool_name}; PWD=\"$(pwd)\"; PATH=\"${PATH}\"."
+  exit 5
+fi
+
diff --git a/cc/toolchains/llvm/x86_64-linux/BUILD.bazel b/cc/toolchains/llvm/x86_64-linux/BUILD.bazel
index 5cad905..408e9cd 100644
--- a/cc/toolchains/llvm/x86_64-linux/BUILD.bazel
+++ b/cc/toolchains/llvm/x86_64-linux/BUILD.bazel
@@ -26,7 +26,10 @@ filegroup(
     srcs = [
         ":wrappers",
         "@x86_64-linux-llvm//:ar",
-    ],
+    ] + select({
+        "//cc:_enable_sysroot": ["@x86_64-sysroot"],
+        "//conditions:default": [],
+    }),
 )
 
 filegroup(
@@ -34,7 +37,10 @@ filegroup(
     srcs = [
         ":wrappers",
         "@x86_64-linux-llvm//:as",
-    ],
+    ] + select({
+        "//cc:_enable_sysroot": ["@x86_64-sysroot"],
+        "//conditions:default": [],
+    }),
 )
 
 filegroup(
@@ -43,7 +49,10 @@ filegroup(
         ":wrappers",
         "@x86_64-linux-llvm//:clang",
         "@x86_64-linux-llvm//:include",
-    ],
+    ] + select({
+        "//cc:_enable_sysroot": ["@x86_64-sysroot"],
+        "//conditions:default": [],
+    }),
 )
 
 filegroup(
@@ -51,7 +60,10 @@ filegroup(
     srcs = [
         ":wrappers",
         "@x86_64-linux-llvm//:dwp",
-    ],
+    ] + select({
+        "//cc:_enable_sysroot": ["@x86_64-sysroot"],
+        "//conditions:default": [],
+    }),
 )
 
 filegroup(
@@ -62,7 +74,10 @@ filegroup(
         "@x86_64-linux-llvm//:clang",
         "@x86_64-linux-llvm//:ld",
         "@x86_64-linux-llvm//:lib",
-    ],
+    ] + select({
+        "//cc:_enable_sysroot": ["@x86_64-sysroot"],
+        "//conditions:default": [],
+    }),
 )
 
 filegroup(
@@ -70,7 +85,10 @@ filegroup(
     srcs = [
         ":wrappers",
         "@x86_64-linux-llvm//:objcopy",
-    ],
+    ] + select({
+        "//cc:_enable_sysroot": ["@x86_64-sysroot"],
+        "//conditions:default": [],
+    }),
 )
 
 filegroup(
@@ -87,19 +105,29 @@ filegroup(
         "linker_files",
         ":compiler_files",
         "@x86_64-linux-llvm//:bin",
-    ],
+    ] + select({
+        "//cc:_enable_sysroot": ["@x86_64-sysroot"],
+        "//conditions:default": [],
+    }),
 )
 
 cc_toolchain_config(
     name = "local-x86_64-linux",
     abi_libc_version = "glibc_unknown",
     abi_version = "clang",
+    builtin_sysroot = select({
+        "//cc:_enable_sysroot": "external/x86_64-sysroot",
+        "//conditions:default": None,
+    }),
     compiler = "clang",
-    cxx_builtin_include_directories = [
-        "/include",
-        "/usr/include",
-        "/usr/local/include",
-    ],
+    cxx_builtin_include_directories = select({
+        "//cc:_enable_sysroot": ["%sysroot%/usr/include"],
+        "//conditions:default": [
+            "/include",
+            "/usr/include",
+            "/usr/local/include",
+        ],
+    }),
     host_system_name = X86_64_LINUX,
     target_cpu = "k8",
     target_libc = "glibc_unknown",