--- linux-4.9.37/fs/jffs2/Makefile	2017-07-12 16:42:41.000000000 +0300
+++ linux-4.9.y/fs/jffs2/Makefile	2021-06-07 13:01:34.000000000 +0300
@@ -18,4 +18,7 @@
 jffs2-$(CONFIG_JFFS2_RTIME)	+= compr_rtime.o
 jffs2-$(CONFIG_JFFS2_ZLIB)	+= compr_zlib.o
 jffs2-$(CONFIG_JFFS2_LZO)	+= compr_lzo.o
+jffs2-$(CONFIG_JFFS2_LZMA)  += compr_lzma.o
 jffs2-$(CONFIG_JFFS2_SUMMARY)   += summary.o
+
+CFLAGS_compr_lzma.o += -Iinclude/linux -Ilib/lzma