diff --git a/cmd/zstream/CMakeLists.txt b/cmd/zstream/CMakeLists.txt
index ba36a3dde933..4e1fb2f41d26 100644
--- a/cmd/zstream/CMakeLists.txt
+++ b/cmd/zstream/CMakeLists.txt
@@ -3,6 +3,7 @@ use_clang()
 
 um_add_executable(zstreamdump
 	zstream.c
+	zstream_decompress.c
 	zstream_dump.c
 	zstream_redup.c
 	zstream_token.c
diff --git a/lib/libspl/include/os/windows/err.h b/lib/libspl/include/os/windows/err.h
new file mode 100644
index 000000000000..7f7dfe14edbc
--- /dev/null
+++ b/lib/libspl/include/os/windows/err.h
@@ -0,0 +1,48 @@
+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License (the "License").
+ * You may not use this file except in compliance with the License.
+ *
+ * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+ * or http://www.opensolaris.org/os/licensing.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ *
+ * When distributing Covered Code, include this CDDL HEADER in each
+ * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+ * If applicable, add the following below this CDDL HEADER, with the
+ * fields enclosed by brackets "[]" replaced with your own identifying
+ * information: Portions Copyright [yyyy] [name of copyright owner]
+ *
+ * CDDL HEADER END
+ */
+
+#ifndef _SPL_ERR_H
+#define	_SPL_ERR_H
+
+#include <sys/debug.h>
+
+void	err(int, const char*, ...) _Noreturn __printf0like(2, 3);
+void	errx(int, const char*, ...) _Noreturn __printf0like(2, 3);
+void	warnx(const char*, ...) __printflike(1, 2);
+
+inline static void
+err(int x, const char *f, ...)
+{
+}
+
+inline static void
+errx(int x, const char *f, ...)
+{
+	exit(x);
+}
+
+inline static void
+warnx(const char *, ...)
+{
+	exit(1);
+}
+
+#endif
diff --git a/lib/libspl/include/os/windows/search.h b/lib/libspl/include/os/windows/search.h
new file mode 100644
index 000000000000..1813c09dcd5b
--- /dev/null
+++ b/lib/libspl/include/os/windows/search.h
@@ -0,0 +1,55 @@
+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License (the "License").
+ * You may not use this file except in compliance with the License.
+ *
+ * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+ * or http://www.opensolaris.org/os/licensing.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ *
+ * When distributing Covered Code, include this CDDL HEADER in each
+ * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+ * If applicable, add the following below this CDDL HEADER, with the
+ * fields enclosed by brackets "[]" replaced with your own identifying
+ * information: Portions Copyright [yyyy] [name of copyright owner]
+ *
+ * CDDL HEADER END
+ */
+
+#ifndef _SPL_SEARCH_H
+#define	_SPL_SEARCH_H
+#include <sys/types.h>
+
+typedef enum {
+	FIND,
+	ENTER
+} ACTION;
+
+typedef struct entry {
+	char *key;
+	void *data;
+} ENTRY;
+
+
+/* Implement me for zstream decompress */
+inline static int
+hcreate(size_t n)
+{
+	return (0);
+}
+
+inline static void
+hdestroy(void)
+{
+}
+
+static inline ENTRY *
+hsearch(ENTRY entry, ACTION action)
+{
+	return (NULL);
+}
+
+#endif
diff --git a/lib/libspl/include/sys/debug.h b/lib/libspl/include/sys/debug.h
index a4bde124d45d..2880f6acd9e0 100644
--- a/lib/libspl/include/sys/debug.h
+++ b/lib/libspl/include/sys/debug.h
@@ -35,6 +35,10 @@
 #define	__printflike(x, y)
 #endif
 
+#ifndef	__printf0like
+#define	__printf0like(x, y)
+#endif
+
 #ifndef __maybe_unused
 #define	__maybe_unused
 #endif
@@ -45,6 +49,10 @@
 #define	__printflike(x, y) __attribute__((__format__(__printf__, x, y)))
 #endif
 
+#ifndef	__printf0like
+#define	__printf0like(x, y) __attribute__((__format__(__printf0__, x, y)))
+#endif
+
 #ifndef __maybe_unused
 #define	__maybe_unused __attribute__((unused))
 #endif