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diff --git a/deps/libchdr/deps/zstd-1.5.5/tests/gzip/zgrep-f.sh b/deps/libchdr/deps/zstd-1.5.5/tests/gzip/zgrep-f.sh
new file mode 100644
index 00000000..1e73ed20
--- /dev/null
+++ b/deps/libchdr/deps/zstd-1.5.5/tests/gzip/zgrep-f.sh
@@ -0,0 +1,43 @@
+#!/bin/sh
+# Ensure that zgrep -f - works like grep -f -
+# Before gzip-1.4, it would fail.
+
+# Copyright (C) 2009-2016 Free Software Foundation, Inc.
+
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+# limit so don't run it by default.
+
+. "${srcdir=.}/init.sh"; path_prepend_ .
+
+printf 'needle\nn2\n' > n || framework_failure_
+cp n haystack || framework_failure_
+gzip haystack || framework_failure_
+
+fail=0
+zgrep -f - haystack.gz < n > out 2>&1 || fail=1
+
+compare out n || fail=1
+
+if ${BASH_VERSION+:} false; then
+  set +o posix
+  # This failed with gzip 1.6.
+  cat n n >nn || framework_failure_
+  eval 'zgrep -h -f <(cat n) haystack.gz haystack.gz' >out || fail=1
+  compare out nn || fail=1
+fi
+
+# This failed with gzip 1.4.
+echo a-b | zgrep -e - > /dev/null || fail=1
+
+Exit $fail