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diff --git a/src/support/path.h b/src/support/path.h
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+++ b/src/support/path.h
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+/*
+ * Copyright 2015 WebAssembly Community Group participants
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+//
+// Command line helpers.
+//
+
+#ifndef wasm_support_path_h
+#define wasm_support_path_h
+
+#include <cstdlib>
+#include <string>
+
+namespace wasm {
+
+namespace Path {
+
+inline std::string getPathSeparator() {
+  // TODO: use c++17's path separator
+  //       http://en.cppreference.com/w/cpp/experimental/fs/path
+#if defined(WIN32) || defined(_WIN32) 
+  return "\\";
+#else
+  return "/";
+#endif
+}
+
+inline std::string getBinaryenRoot() {
+  auto* envVar = getenv("BINARYEN_ROOT");
+  if (envVar) return envVar;
+  return ".";
+}
+
+// Gets the path to a binaryen binary tool, like wasm-opt
+inline std::string getBinaryenBinaryTool(std::string name) {
+  return getBinaryenRoot() + getPathSeparator() +
+         "bin" + getPathSeparator() +
+         name;
+}
+
+} // namespace Path
+
+} // namespace wasm
+
+#endif // wasm_support_path_h