diff --git a/BUILD b/BUILD
index c38493e..5bd11c5 100644
--- a/BUILD
+++ b/BUILD
@@ -9,6 +9,7 @@ filegroup(
     srcs = [
         "BUILD",
         "WORKSPACE",
+        "//abi:srcs",
         "//cpu:srcs",
         "//os:srcs",
     ],
diff --git a/abi/BUILD b/abi/BUILD
new file mode 100644
index 0000000..b4d14dd
--- /dev/null
+++ b/abi/BUILD
@@ -0,0 +1,29 @@
+# Standard constraint_setting and constraint_values to be used in platforms.
+licenses(["notice"])
+
+package(
+    default_visibility = ["//visibility:public"],
+)
+
+filegroup(
+    name = "srcs",
+    srcs = glob(["**"]),
+)
+
+# To add a new constraint_value see https://github.com/bazelbuild/platforms.
+constraint_setting(name = "abi")
+
+constraint_value(
+    name = "gnu",
+    constraint_setting = ":abi",
+)
+
+constraint_value(
+    name = "musl",
+    constraint_setting = ":abi",
+)
+
+constraint_value(
+    name = "msvc",
+    constraint_setting = ":abi",
+)