In t/t5000-tar-tree.sh the variable GZIP is used for the command name.
>From man gzip:

> The environment variable GZIP can hold a set of default options for
> gzip. These options are interpreted first and can be overwritten by
> explicit command line parameters.

So using any other variable name fixes this.
---
 t/t5000-tar-tree.sh | 20 ++++++++++----------
 1 file changed, 10 insertions(+), 10 deletions(-)

diff --git a/t/t5000-tar-tree.sh b/t/t5000-tar-tree.sh
index c2023b1..01b0ed9 100755
--- a/t/t5000-tar-tree.sh
+++ b/t/t5000-tar-tree.sh
@@ -25,7 +25,7 @@ commit id embedding:
 '
 
 . ./test-lib.sh
-GZIP=${GZIP:-gzip}
+GZIPCMD=${GZIPCMD:-gzip}
 GUNZIP=${GUNZIP:-gzip -d}
 
 SUBSTFORMAT=%H%n
@@ -275,27 +275,27 @@ test_expect_success 'only enabled filters are available 
remotely' '
        test_cmp remote.bar config.bar
 '
 
-if $GZIP --version >/dev/null 2>&1; then
-       test_set_prereq GZIP
+if $GZIPCMD --version >/dev/null 2>&1; then
+       test_set_prereq GZIPCMD
 else
        say "Skipping some tar.gz tests because gzip not found"
 fi
 
-test_expect_success GZIP 'git archive --format=tgz' '
+test_expect_success GZIPCMD 'git archive --format=tgz' '
        git archive --format=tgz HEAD >j.tgz
 '
 
-test_expect_success GZIP 'git archive --format=tar.gz' '
+test_expect_success GZIPCMD 'git archive --format=tar.gz' '
        git archive --format=tar.gz HEAD >j1.tar.gz &&
        test_cmp j.tgz j1.tar.gz
 '
 
-test_expect_success GZIP 'infer tgz from .tgz filename' '
+test_expect_success GZIPCMD 'infer tgz from .tgz filename' '
        git archive --output=j2.tgz HEAD &&
        test_cmp j.tgz j2.tgz
 '
 
-test_expect_success GZIP 'infer tgz from .tar.gz filename' '
+test_expect_success GZIPCMD 'infer tgz from .tar.gz filename' '
        git archive --output=j3.tar.gz HEAD &&
        test_cmp j.tgz j3.tar.gz
 '
@@ -306,17 +306,17 @@ else
        say "Skipping some tar.gz tests because gunzip was not found"
 fi
 
-test_expect_success GZIP,GUNZIP 'extract tgz file' '
+test_expect_success GZIPCMD,GUNZIP 'extract tgz file' '
        $GUNZIP -c <j.tgz >j.tar &&
        test_cmp b.tar j.tar
 '
 
-test_expect_success GZIP 'remote tar.gz is allowed by default' '
+test_expect_success GZIPCMD 'remote tar.gz is allowed by default' '
        git archive --remote=. --format=tar.gz HEAD >remote.tar.gz &&
        test_cmp j.tgz remote.tar.gz
 '
 
-test_expect_success GZIP 'remote tar.gz can be disabled' '
+test_expect_success GZIPCMD 'remote tar.gz can be disabled' '
        git config tar.tar.gz.remote false &&
        test_must_fail git archive --remote=. --format=tar.gz HEAD \
                >remote.tar.gz
-- 
1.8.5

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