diff --git a/util/BUILD.toplevel b/util/BUILD.toplevel
index 48dc920..e57b6e2 100644
--- a/util/BUILD.toplevel
+++ b/util/BUILD.toplevel
@@ -12,153 +12,26 @@
 # OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
 # CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */
 
-load("@rules_cc//cc:defs.bzl", "cc_binary", "cc_library")
-load(
-    ":BUILD.generated.bzl",
-    "crypto_headers",
-    "crypto_internal_headers",
-    "crypto_sources",
-    "crypto_sources_asm",
-    "fips_fragments",
-    "ssl_headers",
-    "ssl_internal_headers",
-    "ssl_sources",
-    "tool_headers",
-    "tool_sources",
-)
+# This BUILD file is used as part of the synthesized "-with-bazel" branches. We
+# are in the process of transitioning to keeping all builds at tip-of-tree
+# directly, see https://crbug.com/boringssl/542. This means, in the synthesized
+# branch, "src" now reads as a separate Bazel package. Rather than suppress
+# those build files, alias the targets.
 
-licenses(["notice"])
-
-exports_files(["LICENSE"])
-
-# By default, the C files will expect assembly files, if any, to be linked in
-# with the build. This default can be flipped with -DOPENSSL_NO_ASM. If building
-# in a configuration where we have no assembly optimizations, -DOPENSSL_NO_ASM
-# has no effect, and either value is fine.
-#
-# Like C files, assembly files are wrapped in #ifdef (or NASM equivalent), so it
-# is safe to include a file for the wrong platform in the build. It will just
-# output an empty object file. However, we need some platform selectors to
-# distinguish between gas or NASM syntax.
-#
-# For all non-Windows platforms, we use gas assembly syntax and can assume any
-# GCC-compatible toolchain includes a gas-compatible assembler.
-#
-# For Windows, we use NASM on x86 and x86_64 and gas, specifically
-# clang-assembler, on aarch64. We have not yet added NASM support to this build,
-# and would need to detect MSVC vs clang-cl for aarch64 so, for now, we just
-# disable assembly on Windows across the board.
-#
-# These two selects for asm_sources and asm_copts must be kept in sync. If we
-# specify assembly, we don't want OPENSSL_NO_ASM. If we don't specify assembly,
-# we want OPENSSL_NO_ASM, in case the C files expect them in some format (e.g.
-# NASM) this build file doesn't yet support.
-#
-# TODO(https://crbug.com/boringssl/531): Enable assembly for Windows.
-asm_sources = select({
-    "@platforms//os:windows": [],
-    "//conditions:default": crypto_sources_asm,
-})
-asm_copts = select({
-    "@platforms//os:windows": ["-DOPENSSL_NO_ASM"],
-    "//conditions:default": [],
-})
-
-# Configure C, C++, and common flags for GCC-compatible toolchains.
-#
-# TODO(davidben): Can we remove some of these? In Bazel, are warnings the
-# toolchain or project's responsibility? -Wa,--noexecstack should be unnecessary
-# now, though https://crbug.com/boringssl/292 tracks testing this in CI.
-# -fno-common did not become default until
-# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85678.
-gcc_copts = [
-    # Assembler option --noexecstack adds .note.GNU-stack to each object to
-    # ensure that binaries can be built with non-executable stack.
-    "-Wa,--noexecstack",
-
-    # This list of warnings should match those in the top-level CMakeLists.txt.
-    "-Wall",
-    "-Werror",
-    "-Wformat=2",
-    "-Wsign-compare",
-    "-Wmissing-field-initializers",
-    "-Wwrite-strings",
-    "-Wshadow",
-    "-fno-common",
-]
-gcc_copts_c11 = [
-    "-std=c11",
-    "-Wmissing-prototypes",
-    "-Wold-style-definition",
-    "-Wstrict-prototypes",
-]
-gcc_copts_cxx = [
-    "-std=c++14",
-    "-Wmissing-declarations",
-]
-
-boringssl_copts = [
-    "-DBORINGSSL_IMPLEMENTATION",
-] + select({
-    # We assume that non-Windows builds use a GCC-compatible toolchain and that
-    # Windows builds do not.
-    #
-    # TODO(davidben): Should these be querying something in @bazel_tools?
-    # Unfortunately, @bazel_tools is undocumented. See
-    # https://github.com/bazelbuild/bazel/issues/14914
-    "@platforms//os:windows": [],
-    "//conditions:default": gcc_copts,
-}) + select({
-    # This is needed on glibc systems to get rwlock in pthreads, but it should
-    # not be set on Apple platforms or FreeBSD, where it instead disables APIs
-    # we use.
-    # See compat(5), sys/cdefs.h, and https://crbug.com/boringssl/471
-    "@platforms//os:linux": ["-D_XOPEN_SOURCE=700"],
-    # Without WIN32_LEAN_AND_MEAN, <windows.h> pulls in wincrypt.h, which
-    # conflicts with our <openssl/x509.h>.
-    "@platforms//os:windows": ["-DWIN32_LEAN_AND_MEAN"],
-    "//conditions:default": [],
-}) + asm_copts
-
-boringssl_copts_c11 = boringssl_copts + select({
-    "@platforms//os:windows": ["/std:c11"],
-    "//conditions:default": gcc_copts_c11,
-})
-
-boringssl_copts_cxx = boringssl_copts + select({
-    "@platforms//os:windows": [],
-    "//conditions:default": gcc_copts_cxx,
-})
-
-cc_library(
+alias(
     name = "crypto",
-    srcs = crypto_sources + crypto_internal_headers + asm_sources,
-    hdrs = crypto_headers + fips_fragments,
-    copts = boringssl_copts_c11,
-    includes = ["src/include"],
-    linkopts = select({
-        "@platforms//os:windows": ["-defaultlib:advapi32.lib"],
-        "//conditions:default": ["-pthread"],
-    }),
+    actual = "//src:crypto",
     visibility = ["//visibility:public"],
 )
 
-cc_library(
+alias(
     name = "ssl",
-    srcs = ssl_sources + ssl_internal_headers,
-    hdrs = ssl_headers,
-    copts = boringssl_copts_cxx,
-    includes = ["src/include"],
+    actual = "//src:ssl",
     visibility = ["//visibility:public"],
-    deps = [
-        ":crypto",
-    ],
 )
 
-cc_binary(
+alias(
     name = "bssl",
-    srcs = tool_sources + tool_headers,
-    copts = boringssl_copts_cxx,
+    actual = "//src:bssl",
     visibility = ["//visibility:public"],
-    deps = [":ssl"],
 )