v4.19.13 snapshot.
diff --git a/include/linux/decompress/unlzma.h b/include/linux/decompress/unlzma.h
new file mode 100644
index 0000000..1c930f1
--- /dev/null
+++ b/include/linux/decompress/unlzma.h
@@ -0,0 +1,13 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef DECOMPRESS_UNLZMA_H
+#define DECOMPRESS_UNLZMA_H
+
+int unlzma(unsigned char *, long,
+ long (*fill)(void*, unsigned long),
+ long (*flush)(void*, unsigned long),
+ unsigned char *output,
+ long *posp,
+ void(*error)(char *x)
+ );
+
+#endif