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diff --git a/deps/libchdr/deps/zstd-1.5.5/tests/gzip/zgrep-context.sh b/deps/libchdr/deps/zstd-1.5.5/tests/gzip/zgrep-context.sh
new file mode 100644
index 00000000..d213426a
--- /dev/null
+++ b/deps/libchdr/deps/zstd-1.5.5/tests/gzip/zgrep-context.sh
@@ -0,0 +1,47 @@
+#!/bin/sh
+# Ensure that zgrep -15 works.  Before gzip-1.5, it would fail.
+
+# Copyright (C) 2012-2016 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_ .
+
+# A limited replacement for seq: handle 1 or 2 args; increment must be 1
+seq()
+{
+  case $# in
+    1) start=1  final=$1;;
+    2) start=$1 final=$2;;
+    *) echo you lose 1>&2; exit 1;;
+  esac
+  awk 'BEGIN{for(i='$start';i<='$final';i++) print i}' < /dev/null
+}
+
+seq 40 > in || framework_failure_
+gzip < in > in.gz || framework_failure_
+seq 2 32 > exp || framework_failure_
+
+: ${GREP=grep}
+$GREP -15 17 - < in > out && compare exp out || {
+  echo >&2 "$0: $GREP does not support context options; skipping this test"
+  exit 77
+}
+
+fail=0
+zgrep -15 17 - < in.gz > out || fail=1
+compare exp out || fail=1
+
+Exit $fail