diff -urN ../busybox-1.31.1.orig/archival/libarchive/open_transformer.c ./archival/libarchive/open_transformer.c
--- ../busybox-1.31.1.orig/archival/libarchive/open_transformer.c	1970-01-01 03:00:00.000000000 +0300
+++ ./archival/libarchive/open_transformer.c	2019-11-03 00:50:43.567361034 +0300
@@ -206,12 +206,20 @@
 			goto found_magic;
 		}
 	}
+	if (ENABLE_FEATURE_SEAMLESS_LZMA
+	 && xstate->magic.b16[0] == LZMA_MAGIC
+	) {
+		xstate->xformer = unpack_lzma_stream;
+		USE_FOR_NOMMU(xstate->xformer_prog = "unlzma";)
+		goto found_magic;
+	}
 
 	/* No known magic seen */
 	if (fail_if_not_compressed)
 		bb_error_msg_and_die("no gzip"
 			IF_FEATURE_SEAMLESS_BZ2("/bzip2")
 			IF_FEATURE_SEAMLESS_XZ("/xz")
+			IF_FEATURE_SEAMLESS_LZMA("/lzma")
 			" magic");
 
 	/* Some callers expect this function to "consume" fd
diff -urN ../busybox-1.25.1.orig/include/bb_archive.h ./include/bb_archive.h
--- ../busybox-1.25.1.orig/include/bb_archive.h	2016-09-27 19:53:50.000000000 +0300
+++ ./include/bb_archive.h	2016-11-01 15:53:05.538387531 +0300
@@ -17,6 +17,8 @@
 	/* (unsigned) cast suppresses "integer overflow in expression" warning */
 	XZ_MAGIC1a  = 256 * (unsigned)(256 * (256 * 0xfd + '7') + 'z') + 'X',
 	XZ_MAGIC2a  = 256 * 'Z' + 0,
+	/* lzma default options: lc=3 lp=0 pb=2, historic % 256 == 0 */
+	LZMA_MAGIC  = 0x5d00,
 #else
 	COMPRESS_MAGIC = 0x9d1f,
 	GZIP_MAGIC  = 0x8b1f,
@@ -25,6 +27,8 @@
 	XZ_MAGIC2   = 'z' + ('X' + ('Z' + 0 * 256) * 256) * 256,
 	XZ_MAGIC1a  = 0xfd + ('7' + ('z' + 'X' * 256) * 256) * 256,
 	XZ_MAGIC2a  = 'Z' + 0 * 256,
+	/* lzma default options: lc=3 lp=0 pb=2, historic % 256 == 0 */
+	LZMA_MAGIC  = 0x5d,
 #endif
 };