diff --git a/BUCK b/BUCK
deleted file mode 100644
index eb96206f..00000000
--- a/BUCK
+++ /dev/null
@@ -1,83 +0,0 @@
-# Copyright (c) Facebook, Inc. and its affiliates.
-#
-# This source code is licensed under the MIT license found in the
-# LICENSE file in the root directory of this source tree.
-load("//tools/build_defs/oss:yoga_defs.bzl", "BASE_COMPILER_FLAGS", "GTEST_TARGET", "LIBRARY_COMPILER_FLAGS", "YOGA_ROOTS", "subdir_glob", "yoga_cxx_library", "yoga_cxx_test", "yoga_dep", "yoga_prebuilt_cxx_library")
-
-GMOCK_OVERRIDE_FLAGS = [
-    # gmock does not mark mocked methods as override, ignore the warnings in tests
-    "-Wno-inconsistent-missing-override",
-]
-
-TEST_COMPILER_FLAGS = BASE_COMPILER_FLAGS + GMOCK_OVERRIDE_FLAGS + [
-    "-DDEBUG",
-    "-DYG_ENABLE_EVENTS",
-]
-
-yoga_prebuilt_cxx_library(
-    name = "ndklog",
-    exported_platform_linker_flags = [
-        (
-            "^android.*",
-            ["-llog"],
-        ),
-    ],
-    header_only = True,
-    visibility = YOGA_ROOTS,
-)
-
-yoga_cxx_library(
-    name = "yoga",
-    srcs = glob(["yoga/**/*.cpp"]),
-    compiler_flags = LIBRARY_COMPILER_FLAGS,
-    public_include_directories = ["."],
-    raw_headers = glob(["yoga/**/*.h"]),
-    soname = "libyogacore.$(ext)",
-    tests = [":YogaTests"],
-    visibility = ["PUBLIC"],
-    deps = [
-        ":ndklog",
-    ],
-)
-
-yoga_cxx_library(
-    name = "yoga-static",
-    srcs = glob(["yoga/**/*.cpp"]),
-    compiler_flags = LIBRARY_COMPILER_FLAGS,
-    preferred_linkage = "static",
-    public_include_directories = ["."],
-    raw_headers = glob(["yoga/**/*.h"]),
-    tests = [":YogaTests"],
-    visibility = ["PUBLIC"],
-    deps = [
-        ":ndklog",
-    ],
-)
-
-yoga_cxx_library(
-    name = "yogaForDebug",
-    srcs = glob(["yoga/**/*.cpp"]),
-    compiler_flags = TEST_COMPILER_FLAGS,
-    public_include_directories = ["."],
-    raw_headers = glob(["yoga/**/*.h"]),
-    soname = "libyogacore.$(ext)",
-    tests = [":YogaTests"],
-    visibility = ["PUBLIC"],
-    deps = [
-        ":yoga",
-    ],
-)
-
-yoga_cxx_test(
-    name = "YogaTests",
-    srcs = glob(["tests/*.cpp"]),
-    headers = subdir_glob([("", "yoga/**/*.h")]),
-    compiler_flags = TEST_COMPILER_FLAGS,
-    contacts = ["emilsj@fb.com"],
-    visibility = ["PUBLIC"],
-    deps = [
-        ":yogaForDebug",
-        yoga_dep("testutil:testutil"),
-        GTEST_TARGET,
-    ],
-)
diff --git a/YogaKit/BUCK b/YogaKit/BUCK
deleted file mode 100644
index b6acee5f..00000000
--- a/YogaKit/BUCK
+++ /dev/null
@@ -1,74 +0,0 @@
-# Copyright (c) Facebook, Inc. and its affiliates.
-#
-# This source code is licensed under the MIT license found in the
-# LICENSE file in the root directory of this source tree.
-load("//tools/build_defs/oss:yoga_defs.bzl", "subdir_glob", "yoga_apple_library", "yoga_apple_test", "yoga_dep")
-
-COMPILER_FLAGS = [
-    "-fobjc-arc",
-    "-Wconditional-uninitialized",
-    "-Wdangling-else",
-    "-Wdeprecated-declarations",
-    "-Wimplicit-retain-self",
-    "-Wincomplete-implementation",
-    "-Wobjc-method-access",
-    "-Wobjc-missing-super-calls",
-    "-Wmismatched-return-types",
-    "-Wreturn-type",
-    "-Wno-global-constructors",
-    "-Wno-shadow",
-    "-Wunused-const-variable",
-    "-Wunused-function",
-    "-Wunused-property-ivar",
-    "-Wunused-result",
-    "-Wunused-value",
-]
-
-yoga_apple_library(
-    name = "YogaKit",
-    srcs = glob(["Source/**/*.m"]),
-    header_namespace = "",
-    exported_headers = subdir_glob(
-        [
-            ("", "Source/**/*.h"),
-            ("Source", "**/*.h"),
-        ],
-        prefix = "YogaKit",
-    ),
-    compiler_flags = COMPILER_FLAGS,
-    frameworks = [
-        "$SDKROOT/System/Library/Frameworks/CoreGraphics.framework",
-        "$SDKROOT/System/Library/Frameworks/Foundation.framework",
-        "$SDKROOT/System/Library/Frameworks/UIKit.framework",
-    ],
-    header_path_prefix = "",
-    labels = ["skip_module_validation"],
-    link_whole = True,
-    modular = True,
-    module_name = "YogaKit",
-    sdk_modules = [
-        "CoreGraphics",
-        "Foundation",
-        "UIKit",
-    ],
-    use_submodules = False,
-    visibility = ["PUBLIC"],
-    deps = [
-        yoga_dep(":yoga"),
-    ],
-)
-
-yoga_apple_test(
-    name = "YogaKitTests",
-    srcs = glob(["Tests/**/*.m"]),
-    compiler_flags = COMPILER_FLAGS,
-    frameworks = [
-        "$PLATFORM_DIR/Developer/Library/Frameworks/XCTest.framework",
-        "$SDKROOT/System/Library/Frameworks/CoreGraphics.framework",
-    ],
-    info_plist = "Tests/Info.plist",
-    visibility = ["PUBLIC"],
-    deps = [
-        ":YogaKit",
-    ],
-)
diff --git a/android/BUCK b/android/BUCK
deleted file mode 100644
index 72548072..00000000
--- a/android/BUCK
+++ /dev/null
@@ -1,30 +0,0 @@
-# Copyright (c) Facebook, Inc. and its affiliates.
-#
-# This source code is licensed under the MIT license found in the
-# LICENSE file in the root directory of this source tree.
-
-load("//tools/build_defs/oss:yoga_defs.bzl", "ANDROID_JAVA_TARGET", "ANDROID_RES_TARGET", "JAVA_TARGET", "PROGUARD_ANNOTATIONS_TARGET", "yoga_android_aar", "yoga_android_resource")
-
-yoga_android_aar(
-    name = "android",
-    enable_relinker = True,
-    manifest_skeleton = "src/main/AndroidManifest.xml",
-    visibility = [
-        "PUBLIC",
-    ],
-    deps = [
-        ANDROID_JAVA_TARGET,
-        ANDROID_RES_TARGET,
-        JAVA_TARGET,
-        PROGUARD_ANNOTATIONS_TARGET,
-    ],
-)
-
-yoga_android_resource(
-    name = "res",
-    package = "com.facebook.yoga.android",
-    res = "src/main/res",
-    visibility = [
-        "PUBLIC",
-    ],
-)
diff --git a/android/sample/BUCK b/android/sample/BUCK
deleted file mode 100644
index 0989fcd6..00000000
--- a/android/sample/BUCK
+++ /dev/null
@@ -1,36 +0,0 @@
-# Copyright 2014-present, Facebook, Inc.
-# All rights reserved.
-#
-# This source code is licensed under the license found in the
-# LICENSE-examples file in the root directory of this source tree.
-
-load("//tools/build_defs:fb_native_wrapper.bzl", "fb_native")
-load("//tools/build_defs/oss:yoga_defs.bzl", "ANDROID_RES_TARGET", "ANDROID_SAMPLE_JAVA_TARGET", "ANDROID_SAMPLE_RES_TARGET", "yoga_android_binary", "yoga_android_resource")
-
-yoga_android_binary(
-    name = "sample",
-    keystore = ":debug_keystore",
-    manifest = "AndroidManifest.xml",
-    deps = [
-        ANDROID_SAMPLE_JAVA_TARGET,
-        ANDROID_SAMPLE_RES_TARGET,
-    ],
-)
-
-yoga_android_resource(
-    name = "res",
-    package = "com.facebook.samples.yoga",
-    res = "res",
-    visibility = [
-        "PUBLIC",
-    ],
-    deps = [
-        ANDROID_RES_TARGET,
-    ],
-)
-
-fb_native.keystore(
-    name = "debug_keystore",
-    properties = "debug.keystore.properties",
-    store = "debug.keystore",
-)
diff --git a/android/sample/java/com/facebook/samples/yoga/BUCK b/android/sample/java/com/facebook/samples/yoga/BUCK
deleted file mode 100644
index 0bf85aa4..00000000
--- a/android/sample/java/com/facebook/samples/yoga/BUCK
+++ /dev/null
@@ -1,23 +0,0 @@
-# Copyright (c) Facebook, Inc. and its affiliates.
-#
-# This source code is licensed under the license found in the
-# LICENSE-examples file in the root directory of this source tree.
-
-load("//tools/build_defs/oss:yoga_defs.bzl", "ANDROID_JAVA_TARGET", "ANDROID_SAMPLE_RES_TARGET", "ANDROID_SUPPORT_TARGET", "APPCOMPAT_TARGET", "SOLOADER_TARGET", "yoga_android_library")
-
-yoga_android_library(
-    name = "yoga",
-    srcs = glob(["**/*.java"]),
-    autoglob = False,
-    language = "JAVA",
-    visibility = [
-        "PUBLIC",
-    ],
-    deps = [
-        ANDROID_JAVA_TARGET,
-        ANDROID_SAMPLE_RES_TARGET,
-        ANDROID_SUPPORT_TARGET,
-        APPCOMPAT_TARGET,
-        SOLOADER_TARGET,
-    ],
-)
diff --git a/android/src/main/java/com/facebook/yoga/android/BUCK b/android/src/main/java/com/facebook/yoga/android/BUCK
deleted file mode 100644
index a854a673..00000000
--- a/android/src/main/java/com/facebook/yoga/android/BUCK
+++ /dev/null
@@ -1,23 +0,0 @@
-# Copyright (c) Facebook, Inc. and its affiliates.
-#
-# This source code is licensed under the MIT license found in the
-# LICENSE file in the root directory of this source tree.
-
-load("//tools/build_defs/oss:yoga_defs.bzl", "ANDROID_RES_TARGET", "INFER_ANNOTATIONS_TARGET", "JAVA_TARGET", "JSR_305_TARGET", "SOLOADER_TARGET", "yoga_android_library")
-
-yoga_android_library(
-    name = "android",
-    srcs = glob(["**/*.java"]),
-    autoglob = False,
-    language = "JAVA",
-    visibility = [
-        "PUBLIC",
-    ],
-    deps = [
-        ANDROID_RES_TARGET,
-        INFER_ANNOTATIONS_TARGET,
-        JAVA_TARGET,
-        JSR_305_TARGET,
-        SOLOADER_TARGET,
-    ],
-)
diff --git a/benchmark/BUCK b/benchmark/BUCK
deleted file mode 100644
index dbfd5229..00000000
--- a/benchmark/BUCK
+++ /dev/null
@@ -1,24 +0,0 @@
-# Copyright (c) Facebook, Inc. and its affiliates.
-#
-# This source code is licensed under the MIT license found in the
-# LICENSE file in the root directory of this source tree.
-load("//tools/build_defs/oss:yoga_defs.bzl", "subdir_glob", "yoga_cxx_binary", "yoga_dep")
-
-yoga_cxx_binary(
-    name = "benchmark",
-    srcs = glob(["*.c"]),
-    headers = subdir_glob([("", "*.h")]),
-    header_namespace = "",
-    compiler_flags = [
-        "-fno-omit-frame-pointer",
-        "-fexceptions",
-        "-Wall",
-        "-Werror",
-        "-O3",
-        "-std=c11",
-    ],
-    visibility = ["PUBLIC"],
-    deps = [
-        yoga_dep(":yoga"),
-    ],
-)
diff --git a/csharp/BUCK b/csharp/BUCK
deleted file mode 100644
index 81b570e5..00000000
--- a/csharp/BUCK
+++ /dev/null
@@ -1,42 +0,0 @@
-# Copyright (c) Facebook, Inc. and its affiliates.
-#
-# This source code is licensed under the MIT license found in the
-# LICENSE file in the root directory of this source tree.
-
-load("//tools/build_defs:fb_native_wrapper.bzl", "fb_native")
-load(
-    "//tools/build_defs/oss:yoga_defs.bzl",
-    "BASE_COMPILER_FLAGS",
-    "yoga_apple_binary",
-    "yoga_cxx_library",
-    "yoga_dep",
-)
-
-COMPILER_FLAGS = BASE_COMPILER_FLAGS + ["-std=c++11"]
-
-fb_native.csharp_library(
-    name = "yogalibnet46",
-    srcs = glob(["**/*.cs"]),
-    dll_name = "Facebook.Yoga.dll",
-    framework_ver = "net46",
-)
-
-fb_native.csharp_library(
-    name = "yogalibnet45",
-    srcs = glob(["**/*.cs"]),
-    dll_name = "Facebook.Yoga.dll",
-    framework_ver = "net45",
-)
-
-yoga_cxx_library(
-    name = "yoganet",
-    srcs = ["Yoga/YGInterop.cpp"],
-    compiler_flags = COMPILER_FLAGS,
-    link_style = "static",
-    link_whole = True,
-    soname = "libyoga.$(ext)",
-    visibility = ["PUBLIC"],
-    deps = [yoga_dep(":yoga")],
-)
-
-yoga_apple_binary()
diff --git a/java/BUCK b/java/BUCK
deleted file mode 100644
index b9ef88d9..00000000
--- a/java/BUCK
+++ /dev/null
@@ -1,128 +0,0 @@
-# Copyright (c) Facebook, Inc. and its affiliates.
-#
-# This source code is licensed under the MIT license found in the
-# LICENSE file in the root directory of this source tree.
-
-load("//tools/build_defs/oss:yoga_defs.bzl", "ANDROID", "CXX", "CXX_LIBRARY_WHITELIST", "JNI_TARGET", "JSR_305_TARGET", "JUNIT_TARGET", "PROGUARD_ANNOTATIONS_TARGET", "SOLOADER_TARGET", "YOGA_ROOTS", "yoga_android_dep", "yoga_cxx_library", "yoga_dep", "yoga_java_binary", "yoga_java_library", "yoga_java_test", "yoga_prebuilt_cxx_library")
-
-CXX_LIBRARY_WHITELIST_FOR_TESTS = CXX_LIBRARY_WHITELIST + [
-    yoga_android_dep("testutil:jni"),
-    yoga_android_dep("testutil:testutil-jni"),
-]
-
-YOGA_JAVA_IMPLEMENTATION_FILES = [
-    "com/facebook/yoga/*JNI*.java",
-    "com/facebook/yoga/*Factory.java",
-    "com/facebook/yoga/YogaNative.java",
-]
-
-yoga_prebuilt_cxx_library(
-    name = "ndklog",
-    exported_platform_linker_flags = [
-        (
-            "^android.*",
-            ["-llog"],
-        ),
-    ],
-    header_only = True,
-    visibility = YOGA_ROOTS,
-)
-
-yoga_cxx_library(
-    name = "jni",
-    srcs = glob(["jni/*.cpp"]),
-    header_namespace = "yoga/java",
-    exported_headers = glob(["jni/*.h"]),
-    allow_jni_merging = True,
-    compiler_flags = [
-        "-fno-omit-frame-pointer",
-        "-fexceptions",
-        "-fvisibility=hidden",
-        "-ffunction-sections",
-        "-fdata-sections",
-        "-fPIC",
-        "-Wall",
-        "-Werror",
-        "-Os",
-        "-std=c++11",
-    ],
-    platforms = (CXX, ANDROID),
-    preprocessor_flags = [
-        "-DFBJNI_WITH_FAST_CALLS",
-    ],
-    soname = "libyoga.$(ext)",
-    visibility = ["PUBLIC"],
-    deps = [
-        JNI_TARGET,
-        yoga_dep(":yoga-static"),
-        ":ndklog",
-    ],
-)
-
-yoga_java_library(
-    name = "java-interface",
-    srcs = glob(
-        ["com/facebook/yoga/*.java"],
-        exclude = YOGA_JAVA_IMPLEMENTATION_FILES,
-    ),
-    required_for_source_only_abi = True,
-    source = "1.7",
-    target = "1.7",
-    visibility = ["PUBLIC"],
-    deps = [
-        JSR_305_TARGET,
-        PROGUARD_ANNOTATIONS_TARGET,
-    ],
-)
-
-yoga_java_library(
-    name = "java-impl",
-    srcs = glob(YOGA_JAVA_IMPLEMENTATION_FILES),
-    required_for_source_only_abi = True,
-    source = "1.7",
-    target = "1.7",
-    deps = [
-        ":java-interface",
-        ":jni",
-        JSR_305_TARGET,
-        PROGUARD_ANNOTATIONS_TARGET,
-        SOLOADER_TARGET,
-    ],
-)
-
-yoga_java_library(
-    name = "java",
-    required_for_source_only_abi = True,
-    source = "1.7",
-    target = "1.7",
-    tests = [
-        yoga_dep("java:tests"),
-    ],
-    visibility = ["PUBLIC"],
-    exported_deps = [
-        ":java-impl",
-        ":java-interface",
-    ],
-)
-
-yoga_java_test(
-    name = "tests",
-    srcs = glob(["tests/**/*.java"]),
-    contacts = ["oncall+yoga@xmail.facebook.com"],
-    cxx_library_whitelist = CXX_LIBRARY_WHITELIST_FOR_TESTS,
-    use_cxx_libraries = True,
-    visibility = ["PUBLIC"],
-    deps = [
-        ":java",
-        yoga_dep("testutil:java"),
-        JUNIT_TARGET,
-    ],
-)
-
-yoga_java_binary(
-    name = "yoga",
-    visibility = ["PUBLIC"],
-    deps = [
-        ":java",
-    ],
-)
diff --git a/java/proguard-annotations/src/main/java/com/facebook/proguard/annotations/BUCK b/java/proguard-annotations/src/main/java/com/facebook/proguard/annotations/BUCK
deleted file mode 100644
index 2eab69c9..00000000
--- a/java/proguard-annotations/src/main/java/com/facebook/proguard/annotations/BUCK
+++ /dev/null
@@ -1,15 +0,0 @@
-# Copyright (c) Facebook, Inc. and its affiliates.
-#
-# This source code is licensed under the MIT license found in the
-# LICENSE file in the root directory of this source tree.
-
-load("//tools/build_defs/oss:yoga_defs.bzl", "yoga_java_library")
-
-yoga_java_library(
-    name = "annotations",
-    srcs = glob(["*.java"]),
-    source = "1.7",
-    target = "1.7",
-    visibility = ["PUBLIC"],
-    deps = [],
-)
diff --git a/lib/android-support/BUCK b/lib/android-support/BUCK
deleted file mode 100644
index 6afe2d4c..00000000
--- a/lib/android-support/BUCK
+++ /dev/null
@@ -1,12 +0,0 @@
-# Copyright (c) Facebook, Inc. and its affiliates.
-#
-# This source code is licensed under the MIT license found in the
-# LICENSE file in the root directory of this source tree.
-
-load("//tools/build_defs/oss:yoga_defs.bzl", "YOGA_ROOTS", "yoga_prebuilt_jar")
-
-yoga_prebuilt_jar(
-    name = "android-support",
-    binary_jar = "android-support-v4.jar",
-    visibility = YOGA_ROOTS,
-)
diff --git a/lib/appcompat/BUCK b/lib/appcompat/BUCK
deleted file mode 100644
index b3262494..00000000
--- a/lib/appcompat/BUCK
+++ /dev/null
@@ -1,13 +0,0 @@
-# Copyright (c) Facebook, Inc. and its affiliates.
-#
-# This source code is licensed under the MIT license found in the
-# LICENSE file in the root directory of this source tree.
-
-load("//tools/build_defs:fb_native_wrapper.bzl", "fb_native")
-load("//tools/build_defs/oss:yoga_defs.bzl", "YOGA_ROOTS")
-
-fb_native.android_prebuilt_aar(
-    name = "appcompat",
-    aar = "appcompat-v7-24.2.1.aar",
-    visibility = YOGA_ROOTS,
-)
diff --git a/lib/appcompat/METADATA.bzl b/lib/appcompat/METADATA.bzl
deleted file mode 100644
index c7abacc9..00000000
--- a/lib/appcompat/METADATA.bzl
+++ /dev/null
@@ -1,7 +0,0 @@
-METADATA = {
-    "maintainers": [
-        "yoga",
-    ],
-    "name": "appcompat",
-    "owner": "yoga",
-}
diff --git a/lib/gtest/BUCK b/lib/gtest/BUCK
deleted file mode 100644
index 7be6a0bd..00000000
--- a/lib/gtest/BUCK
+++ /dev/null
@@ -1,34 +0,0 @@
-# Copyright (c) Facebook, Inc. and its affiliates.
-#
-# This source code is licensed under the MIT license found in the
-# LICENSE file in the root directory of this source tree.
-load("//tools/build_defs/oss:yoga_defs.bzl", "YOGA_ROOTS", "subdir_glob", "yoga_cxx_library", "yoga_prebuilt_cxx_library")
-
-COMPILER_FLAGS = [
-    "-std=c++14",
-    "-Wno-missing-prototypes",
-]
-
-yoga_prebuilt_cxx_library(
-    name = "pthread",
-    exported_linker_flags = [
-        "-lpthread",
-    ],
-    header_only = True,
-)
-
-yoga_cxx_library(
-    name = "gtest",
-    srcs = glob(["googletest/googletest/src/*.cc"]),
-    header_namespace = "",
-    exported_headers = subdir_glob([
-        ("googletest/googletest/include", "**/*.h"),
-        ("googletest/googletest", "src/*.h"),
-        ("googletest/googletest", "src/*.cc"),
-    ]),
-    compiler_flags = COMPILER_FLAGS,
-    visibility = YOGA_ROOTS,
-    deps = [
-        ":pthread",
-    ],
-)
diff --git a/lib/hamcrest/BUCK b/lib/hamcrest/BUCK
deleted file mode 100644
index 3fe01441..00000000
--- a/lib/hamcrest/BUCK
+++ /dev/null
@@ -1,19 +0,0 @@
-# Copyright (c) Facebook, Inc. and its affiliates.
-#
-# This source code is licensed under the MIT license found in the
-# LICENSE file in the root directory of this source tree.
-
-load("//tools/build_defs/oss:yoga_defs.bzl", "YOGA_ROOTS", "yoga_java_library", "yoga_prebuilt_jar")
-
-yoga_prebuilt_jar(
-    name = "hamcrest-jar",
-    binary_jar = "hamcrest-2.1.jar",
-)
-
-yoga_java_library(
-    name = "hamcrest",
-    visibility = YOGA_ROOTS,
-    exported_deps = [
-        ":hamcrest-jar",
-    ],
-)
diff --git a/lib/jni/BUCK b/lib/jni/BUCK
deleted file mode 100644
index 0916c1ee..00000000
--- a/lib/jni/BUCK
+++ /dev/null
@@ -1,18 +0,0 @@
-# Copyright (c) Facebook, Inc. and its affiliates.
-#
-# This source code is licensed under the MIT license found in the
-# LICENSE file in the root directory of this source tree.
-
-load("//tools/build_defs/oss:yoga_defs.bzl", "yoga_cxx_library")
-
-yoga_cxx_library(
-    name = "jni",
-    header_namespace = "",
-    exported_headers = [
-        "jni.h",
-        "real/jni.h",
-    ],
-    force_static = True,
-    preprocessor_flags = ["-fmacro-backtrace-limit=0"],
-    visibility = ["PUBLIC"],
-)
diff --git a/lib/jsr-305/BUCK b/lib/jsr-305/BUCK
deleted file mode 100644
index 6b14e7a1..00000000
--- a/lib/jsr-305/BUCK
+++ /dev/null
@@ -1,19 +0,0 @@
-# Copyright (c) Facebook, Inc. and its affiliates.
-#
-# This source code is licensed under the MIT license found in the
-# LICENSE file in the root directory of this source tree.
-
-load("//tools/build_defs/oss:yoga_defs.bzl", "YOGA_ROOTS", "yoga_java_library", "yoga_prebuilt_jar")
-
-yoga_prebuilt_jar(
-    name = "jsr305-jar",
-    binary_jar = "jsr305.jar",
-)
-
-yoga_java_library(
-    name = "jsr-305",
-    visibility = YOGA_ROOTS,
-    exported_deps = [
-        ":jsr305-jar",
-    ],
-)
diff --git a/lib/junit/BUCK b/lib/junit/BUCK
deleted file mode 100644
index 3e31a777..00000000
--- a/lib/junit/BUCK
+++ /dev/null
@@ -1,19 +0,0 @@
-# Copyright (c) Facebook, Inc. and its affiliates.
-#
-# This source code is licensed under the MIT license found in the
-# LICENSE file in the root directory of this source tree.
-
-load("//tools/build_defs/oss:yoga_defs.bzl", "YOGA_ROOTS", "yoga_java_library", "yoga_prebuilt_jar")
-
-yoga_prebuilt_jar(
-    name = "junit-jar",
-    binary_jar = "junit-4.12.jar",
-)
-
-yoga_java_library(
-    name = "junit",
-    visibility = YOGA_ROOTS,
-    exported_deps = [
-        ":junit-jar",
-    ],
-)
diff --git a/lib/junit/METADATA.bzl b/lib/junit/METADATA.bzl
deleted file mode 100644
index bb2b259d..00000000
--- a/lib/junit/METADATA.bzl
+++ /dev/null
@@ -1,7 +0,0 @@
-METADATA = {
-    "maintainers": [
-        "yoga",
-    ],
-    "name": "junit",
-    "owner": "yoga",
-}
diff --git a/lib/soloader/BUCK b/lib/soloader/BUCK
deleted file mode 100644
index eaff4f68..00000000
--- a/lib/soloader/BUCK
+++ /dev/null
@@ -1,12 +0,0 @@
-# Copyright (c) Facebook, Inc. and its affiliates.
-#
-# This source code is licensed under the MIT license found in the
-# LICENSE file in the root directory of this source tree.
-
-load("//tools/build_defs/oss:yoga_defs.bzl", "YOGA_ROOTS", "yoga_prebuilt_aar")
-
-yoga_prebuilt_aar(
-    name = "soloader",
-    aar = "soloader-0.5.1.aar",
-    visibility = YOGA_ROOTS,
-)
diff --git a/testutil/BUCK b/testutil/BUCK
deleted file mode 100644
index b1712055..00000000
--- a/testutil/BUCK
+++ /dev/null
@@ -1,53 +0,0 @@
-load("//tools/build_defs/oss:yoga_defs.bzl", "ANDROID", "CXX", "FBJNI_TARGET", "LIBRARY_COMPILER_FLAGS", "SOLOADER_TARGET", "subdir_glob", "yoga_cxx_library", "yoga_dep", "yoga_java_library")
-
-yoga_cxx_library(
-    name = "testutil",
-    srcs = ["src/main/cpp/testutil/testutil.cpp"],
-    header_namespace = "",
-    exported_headers = subdir_glob([("src/main/cpp/include", "yoga/testutil/testutil.h")]),
-    compiler_flags = LIBRARY_COMPILER_FLAGS,
-    soname = "libyoga_testutil.$(ext)",
-    visibility = ["PUBLIC"],
-    deps = [yoga_dep(":yoga")],
-)
-
-yoga_cxx_library(
-    name = "testutil-jni",
-    srcs = ["src/main/cpp/testutil/testutil.cpp"],
-    header_namespace = "",
-    exported_headers = subdir_glob([("src/main/cpp/include", "yoga/testutil/testutil.h")]),
-    compiler_flags = LIBRARY_COMPILER_FLAGS,
-    platforms = (CXX, ANDROID),
-    soname = "libyoga_testutil.$(ext)",
-    visibility = ["PUBLIC"],
-    deps = [
-        yoga_dep("java:jni"),
-        yoga_dep(":yoga"),
-    ],
-)
-
-yoga_java_library(
-    name = "java",
-    srcs = ["src/main/java/com/facebook/yoga/TestUtil.java"],
-    source = "1.7",
-    target = "1.7",
-    visibility = ["PUBLIC"],
-    deps = [
-        ":jni",
-        SOLOADER_TARGET,
-    ],
-)
-
-yoga_cxx_library(
-    name = "jni",
-    srcs = ["src/main/cpp/jni/jni.cpp"],
-    allow_jni_merging = False,
-    compiler_flags = LIBRARY_COMPILER_FLAGS,
-    platforms = (CXX, ANDROID),
-    soname = "libyoga_testutil_jni.$(ext)",
-    visibility = ["PUBLIC"],
-    deps = [
-        ":testutil-jni",
-        FBJNI_TARGET,
-    ],
-)
diff --git a/tools/build_defs/fb_native_wrapper.bzl b/tools/build_defs/fb_native_wrapper.bzl
deleted file mode 100644
index 3d246dee..00000000
--- a/tools/build_defs/fb_native_wrapper.bzl
+++ /dev/null
@@ -1,109 +0,0 @@
-# Copyright (c) Facebook, Inc. and its affiliates.
-#
-# This source code is licensed under the MIT license found in the
-# LICENSE file in the root directory of this source tree.
-
-fb_native = struct(
-    android_aar = native.android_aar,
-    android_app_modularity = native.android_app_modularity,
-    android_binary = native.android_binary,
-    android_build_config = native.android_build_config,
-    android_bundle = native.android_bundle,
-    android_instrumentation_apk = native.android_instrumentation_apk,
-    android_instrumentation_test = native.android_instrumentation_test,
-    android_library = native.android_library,
-    android_manifest = native.android_manifest,
-    android_prebuilt_aar = native.android_prebuilt_aar,
-    android_resource = native.android_resource,
-    apk_genrule = native.apk_genrule,
-    apple_asset_catalog = native.apple_asset_catalog,
-    apple_binary = native.apple_binary,
-    apple_bundle = native.apple_bundle,
-    apple_library = native.apple_library,
-    apple_package = native.apple_package,
-    apple_resource = native.apple_resource,
-    apple_test = native.apple_test,
-    cgo_library = native.cgo_library,
-    command_alias = native.command_alias,
-    config_setting = native.config_setting,
-    constraint_setting = native.constraint_setting,
-    constraint_value = native.constraint_value,
-    core_data_model = native.core_data_model,
-    csharp_library = native.csharp_library,
-    cxx_binary = native.cxx_binary,
-    cxx_genrule = native.cxx_genrule,
-    cxx_library = native.cxx_library,
-    cxx_lua_extension = native.cxx_lua_extension,
-    cxx_precompiled_header = native.cxx_precompiled_header,
-    cxx_python_extension = native.cxx_python_extension,
-    cxx_test = native.cxx_test,
-    d_binary = native.d_binary,
-    d_library = native.d_library,
-    d_test = native.d_test,
-    export_file = native.export_file,
-    filegroup = native.filegroup,
-    gen_aidl = native.gen_aidl,
-    genrule = native.genrule,
-    go_binary = native.go_binary,
-    go_library = native.go_library,
-    go_test = native.go_test,
-    groovy_library = native.groovy_library,
-    groovy_test = native.groovy_test,
-    gwt_binary = native.gwt_binary,
-    halide_library = native.halide_library,
-    haskell_binary = native.haskell_binary,
-    haskell_ghci = native.haskell_ghci,
-    haskell_haddock = native.haskell_haddock,
-    haskell_library = native.haskell_library,
-    haskell_prebuilt_library = native.haskell_prebuilt_library,
-    http_archive = native.http_archive,
-    http_file = native.http_file,
-    jar_genrule = native.jar_genrule,
-    java_annotation_processor = native.java_annotation_processor,
-    java_binary = native.java_binary,
-    java_library = native.java_library,
-    java_test = native.java_test,
-    js_bundle = native.js_bundle,
-    js_bundle_genrule = native.js_bundle_genrule,
-    js_library = native.js_library,
-    keystore = native.keystore,
-    kotlin_library = native.kotlin_library,
-    kotlin_test = native.kotlin_test,
-    lua_binary = native.lua_binary,
-    lua_library = native.lua_library,
-    ndk_library = native.ndk_library,
-    ocaml_binary = native.ocaml_binary,
-    ocaml_library = native.ocaml_library,
-    platform = native.platform,
-    prebuilt_apple_framework = native.prebuilt_apple_framework,
-    prebuilt_cxx_library = native.prebuilt_cxx_library,
-    prebuilt_cxx_library_group = native.prebuilt_cxx_library_group,
-    prebuilt_dotnet_library = native.prebuilt_dotnet_library,
-    prebuilt_go_library = native.prebuilt_go_library,
-    prebuilt_jar = native.prebuilt_jar,
-    prebuilt_native_library = native.prebuilt_native_library,
-    prebuilt_ocaml_library = native.prebuilt_ocaml_library,
-    prebuilt_python_library = native.prebuilt_python_library,
-    prebuilt_rust_library = native.prebuilt_rust_library,
-    python_binary = native.python_binary,
-    python_library = native.python_library,
-    python_test = native.python_test,
-    remote_file = native.remote_file,
-    robolectric_test = native.robolectric_test,
-    rust_binary = native.rust_binary,
-    rust_library = native.rust_library,
-    rust_test = native.rust_test,
-    scala_library = native.scala_library,
-    scala_test = native.scala_test,
-    scene_kit_assets = native.scene_kit_assets,
-    sh_binary = native.sh_binary,
-    sh_test = native.sh_test,
-    swift_library = native.swift_library,
-    test_suite = native.test_suite,
-    versioned_alias = native.versioned_alias,
-    worker_tool = native.worker_tool,
-    xcode_postbuild_script = native.xcode_postbuild_script,
-    xcode_prebuild_script = native.xcode_prebuild_script,
-    xcode_workspace_config = native.xcode_workspace_config,
-    zip_file = native.zip_file,
-)
diff --git a/tools/build_defs/oss/yoga_defs.bzl b/tools/build_defs/oss/yoga_defs.bzl
deleted file mode 100644
index 2bf256eb..00000000
--- a/tools/build_defs/oss/yoga_defs.bzl
+++ /dev/null
@@ -1,264 +0,0 @@
-#
-#  Copyright (c) Facebook, Inc. and its affiliates.
-#
-#  This source code is licensed under the MIT license found in the LICENSE
-#  file in the root directory of this source tree.
-#
-"""Provides macros for working with yoga library."""
-
-YOGA_ROOTS = ["//..."]
-
-JAVA_TARGET = "//java:java"
-
-JSR_305_TARGET = "//lib/jsr-305:jsr-305"
-
-JUNIT_TARGET = "//lib/junit:junit"
-
-PROGUARD_ANNOTATIONS_TARGET = "//java/proguard-annotations/src/main/java/com/facebook/proguard/annotations:annotations"
-
-SOLOADER_TARGET = "//lib/soloader:soloader"
-
-GTEST_TARGET = "//lib/gtest:gtest"
-
-JNI_TARGET = "//lib/jni:jni"
-
-FBJNI_TARGET = "//lib/fb:fbjni"
-
-FBJNI_JAVA_TARGET = "//lib/fb/src/main/java/com/facebook/jni:jni"
-
-APPCOMPAT_TARGET = "//lib/appcompat:appcompat"
-
-APPLE = ""
-
-ANDROID = ""
-
-ANDROID_SUPPORT_TARGET = "//lib/android-support:android-support"
-
-ANDROID_TARGET = "//android:android"
-
-ANDROID_JAVA_TARGET = "//android/src/main/java/com/facebook/yoga/android:android"
-
-ANDROID_RES_TARGET = "//android:res"
-
-ANDROID_SAMPLE_JAVA_TARGET = "//android/sample/java/com/facebook/samples/yoga:yoga"
-
-ANDROID_SAMPLE_RES_TARGET = "//android/sample:res"
-
-CXX_LIBRARY_WHITELIST = [
-    "//:yoga",
-    "//lib/fb:fbjni",
-    "//java:jni",
-]
-
-SUPPRESSION_FLAGS = [
-    "-Wno-enum-float-conversion",
-    "-Wno-implicit-float-conversion",
-]
-
-BASE_COMPILER_FLAGS = [
-    "-fno-omit-frame-pointer",
-    "-fexceptions",
-    "-fvisibility=hidden",
-    "-ffunction-sections",
-    "-fdata-sections",
-    "-Wall",
-    "-Werror",
-    "-O2",
-    "-std=c++11",
-    "-DYG_ENABLE_EVENTS",
-] + SUPPRESSION_FLAGS
-
-LIBRARY_COMPILER_FLAGS = BASE_COMPILER_FLAGS + [
-    "-fPIC",
-]
-
-def _paths_join(path, *others):
-    """Joins one or more path components."""
-    result = path
-
-    for p in others:
-        if p.startswith("/"):  # absolute
-            result = p
-        elif not result or result.endswith("/"):
-            result += p
-        else:
-            result += "/" + p
-
-    return result
-
-def subdir_glob(glob_specs, exclude = None, prefix = ""):
-    """Returns a dict of sub-directory relative paths to full paths.
-
-    The subdir_glob() function is useful for defining header maps for C/C++
-    libraries which should be relative the given sub-directory.
-    Given a list of tuples, the form of (relative-sub-directory, glob-pattern),
-    it returns a dict of sub-directory relative paths to full paths.
-
-    Please refer to native.glob() for explanations and examples of the pattern.
-
-    Args:
-      glob_specs: The array of tuples in form of
-        (relative-sub-directory, glob-pattern inside relative-sub-directory).
-        type: List[Tuple[str, str]]
-      exclude: A list of patterns to identify files that should be removed
-        from the set specified by the first argument. Defaults to [].
-        type: Optional[List[str]]
-      prefix: If is not None, prepends it to each key in the dictionary.
-        Defaults to None.
-        type: Optional[str]
-
-    Returns:
-      A dict of sub-directory relative paths to full paths.
-    """
-    if exclude == None:
-        exclude = []
-
-    results = []
-
-    for dirpath, glob_pattern in glob_specs:
-        results.append(
-            _single_subdir_glob(dirpath, glob_pattern, exclude, prefix),
-        )
-
-    return _merge_maps(*results)
-
-def _merge_maps(*file_maps):
-    result = {}
-    for file_map in file_maps:
-        for key in file_map:
-            if key in result and result[key] != file_map[key]:
-                fail(
-                    "Conflicting files in file search paths. " +
-                    "\"%s\" maps to both \"%s\" and \"%s\"." %
-                    (key, result[key], file_map[key]),
-                )
-
-            result[key] = file_map[key]
-
-    return result
-
-def _single_subdir_glob(dirpath, glob_pattern, exclude = None, prefix = None):
-    if exclude == None:
-        exclude = []
-    results = {}
-    files = native.glob([_paths_join(dirpath, glob_pattern)], exclude = exclude)
-    for f in files:
-        if dirpath:
-            key = f[len(dirpath) + 1:]
-        else:
-            key = f
-        if prefix:
-            key = _paths_join(prefix, key)
-        results[key] = f
-
-    return results
-
-def yoga_dep(dep):
-    return "//" + dep
-
-def yoga_cxx_lib(lib):
-    return yoga_dep(lib)
-
-def yoga_android_aar(*args, **kwargs):
-    native.android_aar(*args, **kwargs)
-
-def yoga_android_binary(*args, **kwargs):
-    native.android_binary(*args, **kwargs)
-
-def yoga_android_library(*args, **kwargs):
-    native.android_library(*args, **kwargs)
-
-def yoga_android_resource(*args, **kwargs):
-    native.alias(
-        name = kwargs["name"] + "Android",
-        actual = ":" + kwargs["name"],
-        visibility = kwargs.get("visibility") or ["PUBLIC"],
-    )
-    native.android_resource(*args, **kwargs)
-
-def yoga_apple_library(*args, **kwargs):
-    native.apple_library(*args, **kwargs)
-
-def yoga_apple_test(*args, **kwargs):
-    native.apple_test(*args, **kwargs)
-
-def yoga_cxx_binary(*args, **kwargs):
-    kwargs.pop("platforms", None)
-    native.cxx_binary(*args, **kwargs)
-
-def yoga_cxx_library(*args, **kwargs):
-    # Currently unused
-    kwargs.pop("platforms", None)
-    kwargs.pop("allow_jni_merging", None)
-
-    native.cxx_library(*args, **kwargs)
-
-def yoga_cxx_test(*args, **kwargs):
-    native.cxx_test(*args, **kwargs)
-
-def yoga_java_binary(*args, **kwargs):
-    native.java_binary(*args, **kwargs)
-
-def yoga_java_library(*args, **kwargs):
-    native.java_library(*args, **kwargs)
-
-def yoga_java_test(*args, **kwargs):
-    kwargs["deps"] = kwargs.get("deps", []) + ["//lib/hamcrest:hamcrest"]
-    native.java_test(*args, **kwargs)
-
-def yoga_prebuilt_cxx_library(*args, **kwargs):
-    native.prebuilt_cxx_library(*args, **kwargs)
-
-def yoga_prebuilt_jar(*args, **kwargs):
-    native.alias(
-        name = kwargs["name"] + "Android",
-        actual = ":" + kwargs["name"],
-        visibility = kwargs.get("visibility") or ["PUBLIC"],
-    )
-    native.prebuilt_jar(*args, **kwargs)
-
-def yoga_prebuilt_aar(*args, **kwargs):
-    native.android_prebuilt_aar(*args, **kwargs)
-
-def is_apple_platform():
-    return True
-
-def yoga_apple_binary():
-    if is_apple_platform():
-        yoganet_ios_srcs = []
-        for arch in [
-            "iphonesimulator-x86_64",
-            "iphoneos-arm64",
-        ]:
-            name = "yoganet-" + arch
-            yoganet_ios_srcs.append(":" + name)
-            native.genrule(
-                name = name,
-                srcs = [
-                    yoga_dep(":yogaApple#%s,static" % arch),
-                    yoga_dep("YogaKit:YogaKitApple#%s,static" % arch),
-                    yoga_dep("csharp:yoganetApple#%s,static" % arch),
-                ],
-                out = "libyoga-%s.a" % arch,
-                cmd = "libtool -static -o $OUT $SRCS",
-                visibility = [yoga_dep("csharp:yoganet-ios")],
-            )
-
-        native.genrule(
-            name = "yoganet-ios",
-            srcs = yoganet_ios_srcs,
-            out = "libyoga.a",
-            cmd = "lipo $SRCS -create -output $OUT",
-            visibility = ["PUBLIC"],
-        )
-
-        yoganet_macosx_target = "csharp:yoganetAppleMac#macosx-%s,dynamic"
-        native.genrule(
-            name = "yoganet-macosx",
-            srcs = [
-                yoga_dep(yoganet_macosx_target % "x86_64"),
-            ],
-            out = "libyoga.dylib",
-            cmd = "lipo $SRCS -create -output $OUT",
-            visibility = ["PUBLIC"],
-        )
diff --git a/util/BUCK b/util/BUCK
deleted file mode 100644
index 5b0e9e00..00000000
--- a/util/BUCK
+++ /dev/null
@@ -1,30 +0,0 @@
-# Copyright (c) Facebook, Inc. and its affiliates.
-#
-# This source code is licensed under the MIT license found in the
-# LICENSE file in the root directory of this source tree.
-load("//tools/build_defs/oss:yoga_defs.bzl", "GTEST_TARGET", "LIBRARY_COMPILER_FLAGS", "yoga_cxx_library", "yoga_cxx_test")
-
-_TESTS = glob(["*Test.cpp"])
-
-yoga_cxx_library(
-    name = "util",
-    srcs = glob(
-        ["*.cpp"],
-        exclude = _TESTS,
-    ),
-    header_namespace = "yoga/util",
-    exported_headers = glob(["*.h"]),
-    compiler_flags = LIBRARY_COMPILER_FLAGS,
-    tests = [":test"],
-    visibility = ["PUBLIC"],
-)
-
-yoga_cxx_test(
-    name = "test",
-    srcs = _TESTS,
-    compiler_flags = LIBRARY_COMPILER_FLAGS,
-    deps = [
-        ":util",
-        GTEST_TARGET,
-    ],
-)