diff --git a/libc/malloc_debug/Config.h b/libc/malloc_debug/Config.h
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+++ b/libc/malloc_debug/Config.h
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+/*
+ * Copyright (C) 2015 The Android Open Source Project
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *  * Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *  * Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+ * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#ifndef MALLOC_DEBUG_CONFIG_H
+#define MALLOC_DEBUG_CONFIG_H
+
+#include <stdint.h>
+
+constexpr uint64_t FRONT_GUARD = 0x1;
+constexpr uint64_t REAR_GUARD = 0x2;
+constexpr uint64_t BACKTRACE = 0x4;
+constexpr uint64_t FILL_ON_ALLOC = 0x8;
+constexpr uint64_t FILL_ON_FREE = 0x10;
+constexpr uint64_t EXPAND_ALLOC = 0x20;
+constexpr uint64_t FREE_TRACK = 0x40;
+constexpr uint64_t TRACK_ALLOCS = 0x80;
+constexpr uint64_t LEAK_TRACK = 0x100;
+
+// If only one or more of these options is set, then no special header is needed.
+constexpr uint64_t NO_HEADER_OPTIONS = FILL_ON_ALLOC | FILL_ON_FREE | EXPAND_ALLOC;
+
+struct Config {
+  bool SetFromProperties();
+
+  size_t front_guard_bytes = 0;
+  size_t rear_guard_bytes = 0;
+
+  bool backtrace_enable_on_signal = false;
+  int backtrace_signal = 0;
+  bool backtrace_enabled = false;
+  size_t backtrace_frames = 0;
+
+  size_t fill_on_alloc_bytes = 0;
+  size_t fill_on_free_bytes = 0;
+
+  size_t expand_alloc_bytes = 0;
+
+  size_t free_track_allocations = 0;
+
+  uint64_t options = 0;
+  uint8_t fill_alloc_value;
+  uint8_t fill_free_value;
+  uint8_t front_guard_value;
+  uint8_t rear_guard_value;
+};
+
+#endif  // MALLOC_DEBUG_CONFIG_H