diff --git a/pw_protobuf/BUILD.bazel b/pw_protobuf/BUILD.bazel
index aec797889..6f30ac5df 100644
--- a/pw_protobuf/BUILD.bazel
+++ b/pw_protobuf/BUILD.bazel
@@ -394,14 +394,6 @@ filegroup(
     ],
 )
 
-# TODO(frolv): Figure out what to do about size reports in Bazel.
-filegroup(
-    name = "size_reports",
-    srcs = glob([
-        "size_report/*.cc",
-    ]),
-)
-
 filegroup(
     name = "doxygen",
     srcs = [
diff --git a/pw_toolchain/rust/rust_toolchain.BUILD b/pw_toolchain/rust/rust_toolchain.BUILD
index f8f3bf0de..87e7b1c3e 100644
--- a/pw_toolchain/rust/rust_toolchain.BUILD
+++ b/pw_toolchain/rust/rust_toolchain.BUILD
@@ -22,7 +22,11 @@ filegroup(
 
 filegroup(
     name = "rustc_lib",
-    srcs = glob(["lib/*.so"]),
+    srcs = glob(
+        ["lib/*.so"],
+        # For non-linux operating systems, this comes up empty.
+        allow_empty = True,
+    ),
     visibility = ["//visibility:public"],
 )
 
diff --git a/third_party/stm32cube/cmsis_core.BUILD.bazel b/third_party/stm32cube/cmsis_core.BUILD.bazel
index f6e971370..6ebb7aaac 100644
--- a/third_party/stm32cube/cmsis_core.BUILD.bazel
+++ b/third_party/stm32cube/cmsis_core.BUILD.bazel
@@ -22,6 +22,9 @@ cc_library(
             "Include/*.h",
             "Include/DSP/Include/*.h",
         ],
+        # Some include patterns come up blank, but exist for forward/backwards
+        # compatibility.
+        allow_empty = True,
     ),
     includes = [
         "Include",