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https://github.com/macports/macports-ports/blob/master/archivers/libarchive/files/patch-libarchive-3.5-strnlen.diff

next release should have a fix for this

--- a/libarchive/archive_read_support_format_mtree.c
+++ b/libarchive/archive_read_support_format_mtree.c
@@ -65,6 +65,20 @@ __FBSDID("$FreeBSD: head/lib/libarchive/archive_read_support_format_mtree.c 2011
 #define O_CLOEXEC	0
 #endif
 
+#ifdef __APPLE__
+#if  __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ < 1070
+static size_t strnlen(const char *s, size_t maxlen) {
+  size_t l = 0;
+  while (l < maxlen && *s) {
+    l++;
+    s++;
+  }
+  return l;
+}
+#endif
+#endif
+
+
 #define	MTREE_HAS_DEVICE	0x0001
 #define	MTREE_HAS_FFLAGS	0x0002
 #define	MTREE_HAS_GID		0x0004