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diff --git a/ingen/filesystem.hpp b/ingen/filesystem.hpp
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+++ b/ingen/filesystem.hpp
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+/*
+  This file is part of Ingen.
+  Copyright 2007-2017 David Robillard <http://drobilla.net/>
+
+  Ingen is free software: you can redistribute it and/or modify it under the
+  terms of the GNU Affero General Public License as published by the Free
+  Software Foundation, either version 3 of the License, or any later version.
+
+  Ingen is distributed in the hope that it will be useful, but WITHOUT ANY
+  WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+  A PARTICULAR PURPOSE.  See the GNU Affero General Public License for details.
+
+  You should have received a copy of the GNU Affero General Public License
+  along with Ingen.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef INGEN_FILESYSTEM_HPP
+#define INGEN_FILESYSTEM_HPP
+
+#define _BSD_SOURCE     1
+#define _DEFAULT_SOURCE 1
+
+#include <cerrno>
+#include <climits>
+#include <cstdlib>
+#include <memory>
+#include <vector>
+
+#include <sys/stat.h>
+#include <sys/types.h>
+
+#ifdef _WIN32
+#    include <windows.h>
+#    include <io.h>
+#    define F_OK 0
+#    define mkdir(path, flags) _mkdir(path)
+#endif
+
+#include "ingen/FilePath.hpp"
+
+/* A minimal subset of the std::filesystem API from C++17. */
+
+namespace ingen {
+namespace filesystem {
+
+inline bool exists(const FilePath& path)
+{
+	return !access(path.c_str(), F_OK);
+}
+
+inline bool is_directory(const FilePath& path)
+{
+	struct stat info;
+	stat(path.c_str(), &info);
+	return S_ISDIR(info.st_mode);
+}
+
+inline bool create_directories(const FilePath& path)
+{
+	std::vector<FilePath> paths;
+	for (FilePath p = path; p != path.root_directory(); p = p.parent_path()) {
+		paths.emplace_back(p);
+	}
+
+	for (auto p = paths.rbegin(); p != paths.rend(); ++p) {
+		if (mkdir(p->c_str(), 0755) && errno != EEXIST) {
+			return false;
+		}
+	}
+
+	return true;
+}
+
+inline FilePath current_path()
+{
+	struct Freer { void operator()(char* const ptr) { free(ptr); } };
+
+	std::unique_ptr<char, Freer> cpath(realpath(".", nullptr));
+	const FilePath path(cpath.get());
+	return path;
+}
+
+} // namespace filesystem
+} // namespace ingen
+
+#endif // INGEN_FILESYSTEM_HPP