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diff --git a/src/fsade.h b/src/fsade.h
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+/****************************************************************************
+ * bfs                                                                      *
+ * Copyright (C) 2019-2020 Tavian Barnes <tavianator@tavianator.com>        *
+ *                                                                          *
+ * Permission to use, copy, modify, and/or distribute this software for any *
+ * purpose with or without fee is hereby granted.                           *
+ *                                                                          *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES *
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF         *
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR  *
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES   *
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN    *
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF  *
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.           *
+ ****************************************************************************/
+
+/**
+ * A facade over (file)system features that are (un)implemented differently
+ * between platforms.
+ */
+
+#ifndef BFS_FSADE_H
+#define BFS_FSADE_H
+
+#include "util.h"
+#include <stdbool.h>
+
+#define BFS_CAN_CHECK_ACL BFS_HAS_SYS_ACL
+
+#if !defined(BFS_CAN_CHECK_CAPABILITIES) && BFS_HAS_SYS_CAPABILITY && !__FreeBSD__
+#	include <sys/capability.h>
+#	ifdef CAP_CHOWN
+#		define BFS_CAN_CHECK_CAPABILITIES true
+#	endif
+#endif
+
+#define BFS_CAN_CHECK_XATTRS (BFS_HAS_SYS_EXTATTR || BFS_HAS_SYS_XATTR)
+
+struct BFTW;
+
+/**
+ * Check if a file has a non-trivial Access Control List.
+ *
+ * @param ftwbuf
+ *         The file to check.
+ * @return
+ *         1 if it does, 0 if it doesn't, or -1 if an error occurred.
+ */
+int bfs_check_acl(const struct BFTW *ftwbuf);
+
+/**
+ * Check if a file has a non-trivial capability set.
+ *
+ * @param ftwbuf
+ *         The file to check.
+ * @return
+ *         1 if it does, 0 if it doesn't, or -1 if an error occurred.
+ */
+int bfs_check_capabilities(const struct BFTW *ftwbuf);
+
+/**
+ * Check if a file has any extended attributes set.
+ *
+ * @param ftwbuf
+ *         The file to check.
+ * @return
+ *         1 if it does, 0 if it doesn't, or -1 if an error occurred.
+ */
+int bfs_check_xattrs(const struct BFTW *ftwbuf);
+
+/**
+ * Check if a file has an extended attribute with the given name.
+ *
+ * @param ftwbuf
+ *         The file to check.
+ * @param name
+ *         The name of the xattr to check.
+ * @return
+ *         1 if it does, 0 if it doesn't, or -1 if an error occurred.
+ */
+int bfs_check_xattr_named(const struct BFTW *ftwbuf, const char *name);
+
+#endif // BFS_FSADE_H