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diff --git a/deps/libchdr/deps/zstd-1.5.5/contrib/linux-kernel/Makefile b/deps/libchdr/deps/zstd-1.5.5/contrib/linux-kernel/Makefile
new file mode 100644
index 00000000..63dd15d9
--- /dev/null
+++ b/deps/libchdr/deps/zstd-1.5.5/contrib/linux-kernel/Makefile
@@ -0,0 +1,108 @@
+# ################################################################
+# Copyright (c) Meta Platforms, Inc. and affiliates.
+# All rights reserved.
+#
+# This source code is licensed under both the BSD-style license (found in the
+# LICENSE file in the root directory of this source tree) and the GPLv2 (found
+# in the COPYING file in the root directory of this source tree).
+# You may select, at your option, one of the above-listed licenses.
+# ################################################################
+
+.PHONY: libzstd
+libzstd:
+	rm -rf linux
+	mkdir -p linux
+	mkdir -p linux/include/linux
+	mkdir -p linux/lib/zstd
+	../freestanding_lib/freestanding.py \
+		--source-lib ../../lib \
+		--output-lib linux/lib/zstd \
+		--xxhash '<linux/xxhash.h>' \
+		--xxh64-state 'struct xxh64_state' \
+		--xxh64-prefix 'xxh64' \
+		--rewrite-include '<limits\.h>=<linux/limits.h>' \
+		--rewrite-include '<stddef\.h>=<linux/types.h>' \
+		--rewrite-include '"\.\./zstd.h"=<linux/zstd.h>' \
+		--rewrite-include '"(\.\./)?zstd_errors.h"=<linux/zstd_errors.h>' \
+		--sed 's,/\*\*\*,/* *,g' \
+		--sed 's,/\*\*,/*,g' \
+		--spdx \
+		-DZSTD_NO_INTRINSICS \
+		-DZSTD_NO_UNUSED_FUNCTIONS \
+		-DZSTD_LEGACY_SUPPORT=0 \
+		-DZSTD_STATIC_LINKING_ONLY \
+		-DFSE_STATIC_LINKING_ONLY \
+		-DXXH_STATIC_LINKING_ONLY \
+		-D__GNUC__ \
+		-D__linux__=1 \
+		-DSTATIC_BMI2=0 \
+		-DZSTD_ADDRESS_SANITIZER=0 \
+		-DZSTD_MEMORY_SANITIZER=0 \
+		-DZSTD_DATAFLOW_SANITIZER=0 \
+		-DZSTD_COMPRESS_HEAPMODE=1 \
+		-UNO_PREFETCH \
+		-U__cplusplus \
+		-UZSTD_DLL_EXPORT \
+		-UZSTD_DLL_IMPORT \
+		-U__ICCARM__ \
+		-UZSTD_MULTITHREAD \
+		-U_MSC_VER \
+		-U_WIN32 \
+		-RZSTDLIB_VISIBLE= \
+		-RZSTDERRORLIB_VISIBLE= \
+		-RZSTD_FALLTHROUGH=fallthrough \
+		-DZSTD_HAVE_WEAK_SYMBOLS=0 \
+		-DZSTD_TRACE=0 \
+		-DZSTD_NO_TRACE \
+		-DZSTD_DISABLE_ASM \
+		-DZSTD_LINUX_KERNEL
+	rm linux/lib/zstd/decompress/huf_decompress_amd64.S
+	mv linux/lib/zstd/zstd.h linux/include/linux/zstd_lib.h
+	mv linux/lib/zstd/zstd_errors.h linux/include/linux/
+	cp linux_zstd.h linux/include/linux/zstd.h
+	cp zstd_common_module.c linux/lib/zstd
+	cp zstd_compress_module.c linux/lib/zstd
+	cp zstd_decompress_module.c linux/lib/zstd
+	cp decompress_sources.h linux/lib/zstd
+	cp linux.mk linux/lib/zstd/Makefile
+
+LINUX ?= $(HOME)/repos/linux
+
+.PHONY: import
+import: libzstd
+	rm -f $(LINUX)/include/linux/zstd.h
+	rm -f $(LINUX)/include/linux/zstd_errors.h
+	rm -rf $(LINUX)/lib/zstd
+	cp linux/include/linux/zstd.h $(LINUX)/include/linux
+	cp linux/include/linux/zstd_lib.h $(LINUX)/include/linux
+	cp linux/include/linux/zstd_errors.h $(LINUX)/include/linux
+	cp -r linux/lib/zstd $(LINUX)/lib
+
+import-upstream:
+	rm -rf $(LINUX)/lib/zstd
+	mkdir $(LINUX)/lib/zstd
+	cp ../../lib/zstd.h $(LINUX)/include/linux/zstd_lib.h
+	cp -r ../../lib/common $(LINUX)/lib/zstd
+	cp -r ../../lib/compress $(LINUX)/lib/zstd
+	cp -r ../../lib/decompress $(LINUX)/lib/zstd
+	mv $(LINUX)/lib/zstd/zstd_errors.h $(LINUX)/include/linux
+	rm $(LINUX)/lib/zstd/common/threading.*
+	rm $(LINUX)/lib/zstd/common/pool.*
+	rm $(LINUX)/lib/zstd/common/xxhash.*
+	rm $(LINUX)/lib/zstd/compress/zstdmt_*
+
+DEBUGFLAGS= -Wall -Wextra -Wcast-qual -Wcast-align -Wshadow \
+            -Wstrict-aliasing=1 -Wswitch-enum -Wdeclaration-after-statement \
+            -Wstrict-prototypes -Wundef -Wpointer-arith \
+            -Wvla -Wformat=2 -Winit-self -Wfloat-equal -Wwrite-strings \
+            -Wredundant-decls -Wmissing-prototypes -Wc++-compat \
+	    -Wimplicit-fallthrough
+
+.PHONY: test
+test: libzstd
+	$(MAKE) -C test run-test CFLAGS="-O3 $(CFLAGS) $(DEBUGFLAGS) -Werror" -j
+
+.PHONY: clean
+clean:
+	$(RM) -rf linux
+	$(MAKE) -C test clean