diff -urN a/BUILD.bazel b/BUILD.bazel
--- a/BUILD.bazel	1970-01-01 01:00:00.000000000 +0100
+++ b/BUILD.bazel	2000-01-01 00:00:00.000000000 -0000
@@ -0,0 +1,40 @@
+load("@io_bazel_rules_go//go:def.bzl", "go_library", "go_test")
+
+go_library(
+    name = "xerrors",
+    srcs = [
+        "adaptor.go",
+        "doc.go",
+        "errors.go",
+        "fmt.go",
+        "format.go",
+        "frame.go",
+        "wrap.go",
+    ],
+    importpath = "golang.org/x/xerrors",
+    visibility = ["//visibility:public"],
+    deps = ["//internal"],
+)
+
+alias(
+    name = "go_default_library",
+    actual = ":xerrors",
+    visibility = ["//visibility:public"],
+)
+
+go_test(
+    name = "xerrors_test",
+    srcs = [
+        "errors_test.go",
+        "example_As_test.go",
+        "example_FormatError_test.go",
+        "example_test.go",
+        "fmt_test.go",
+        "fmt_unexported_test.go",
+        "stack_test.go",
+        "wrap_113_test.go",
+        "wrap_test.go",
+    ],
+    embed = [":xerrors"],
+    deps = ["//internal"],
+)
diff -urN a/internal/BUILD.bazel b/internal/BUILD.bazel
--- a/internal/BUILD.bazel	1970-01-01 01:00:00.000000000 +0100
+++ b/internal/BUILD.bazel	2000-01-01 00:00:00.000000000 -0000
@@ -0,0 +1,14 @@
+load("@io_bazel_rules_go//go:def.bzl", "go_library")
+
+go_library(
+    name = "internal",
+    srcs = ["internal.go"],
+    importpath = "golang.org/x/xerrors/internal",
+    visibility = ["//:__subpackages__"],
+)
+
+alias(
+    name = "go_default_library",
+    actual = ":internal",
+    visibility = ["//:__subpackages__"],
+)