v4.19.13 snapshot.
diff --git a/include/linux/decompress/inflate.h b/include/linux/decompress/inflate.h
new file mode 100644
index 0000000..b65f24e
--- /dev/null
+++ b/include/linux/decompress/inflate.h
@@ -0,0 +1,11 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef LINUX_DECOMPRESS_INFLATE_H
+#define LINUX_DECOMPRESS_INFLATE_H
+
+int gunzip(unsigned char *inbuf, long len,
+ long (*fill)(void*, unsigned long),
+ long (*flush)(void*, unsigned long),
+ unsigned char *output,
+ long *pos,
+ void(*error_fn)(char *x));
+#endif