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diff --git a/deps/libchdr/deps/zstd-1.5.5/doc/educational_decoder/Makefile b/deps/libchdr/deps/zstd-1.5.5/doc/educational_decoder/Makefile
new file mode 100644
index 00000000..f6deeb13
--- /dev/null
+++ b/deps/libchdr/deps/zstd-1.5.5/doc/educational_decoder/Makefile
@@ -0,0 +1,62 @@
+# ################################################################
+# 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.
+# ################################################################
+
+ZSTD ?= zstd   # note: requires zstd installation on local system
+
+UNAME?= $(shell uname)
+ifeq ($(UNAME), SunOS)
+DIFF ?= gdiff
+else
+DIFF ?= diff
+endif
+
+HARNESS_FILES=*.c
+
+MULTITHREAD_LDFLAGS = -pthread
+DEBUGFLAGS= -g -DZSTD_DEBUG=1
+CPPFLAGS += -I$(ZSTDDIR) -I$(ZSTDDIR)/common -I$(ZSTDDIR)/compress \
+            -I$(ZSTDDIR)/dictBuilder -I$(ZSTDDIR)/deprecated -I$(PRGDIR)
+CFLAGS   ?= -O2
+CFLAGS   += -Wall -Wextra -Wcast-qual -Wcast-align -Wshadow                 \
+            -Wstrict-aliasing=1 -Wswitch-enum                               \
+            -Wredundant-decls -Wstrict-prototypes -Wundef                   \
+            -Wvla -Wformat=2 -Winit-self -Wfloat-equal -Wwrite-strings      \
+            -std=c99
+CFLAGS   += $(DEBUGFLAGS)
+CFLAGS   += $(MOREFLAGS)
+FLAGS     = $(CPPFLAGS) $(CFLAGS) $(LDFLAGS) $(MULTITHREAD_LDFLAGS)
+
+harness: $(HARNESS_FILES)
+	$(CC) $(FLAGS) $^ -o $@
+
+clean:
+	@$(RM) harness *.o
+	@$(RM) -rf harness.dSYM  # MacOS specific
+
+test: harness
+	#
+	# Testing single-file decompression with educational decoder
+	#
+	@$(ZSTD) -f README.md -o tmp.zst
+	@./harness tmp.zst tmp
+	@$(DIFF) -s tmp README.md
+	@$(RM) tmp*
+	#
+	# Testing dictionary decompression with education decoder
+	#
+	# note : files are presented multiple for training, to reach minimum threshold
+	@$(ZSTD) --train harness.c zstd_decompress.c zstd_decompress.h README.md \
+                  harness.c zstd_decompress.c zstd_decompress.h README.md \
+                  harness.c zstd_decompress.c zstd_decompress.h README.md \
+                  -o dictionary
+	@$(ZSTD) -f README.md -D dictionary -o tmp.zst
+	@./harness tmp.zst tmp dictionary
+	@$(DIFF) -s tmp README.md
+	@$(RM) tmp* dictionary