--- /dev/null
+/*
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+#ifndef NOTMUCH_UTIL_PATH_UTIL_H_
+#define NOTMUCH_UTIL_PATH_UTIL_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+char *
+notmuch_canonicalize_file_name (const char *path);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* NOTMUCH_UTIL_PATH_UTIL_H_ */