t7800 fails on systems where readlink (GNUism?) is not available.
An easy workaround for the very basic readlink usage of this test
would be to use a shell function like this:
---
diff --git a/t/t7800-difftool.sh b/t/t7800-difftool.sh
index ff7a9e9..be3d19f 100755
--- a/t/t7800-difftool.sh
+++ b/t/t7800-difftool.sh
@@ -420,6 +420,7 @@ run_dir_diff_test 'difftool --dir-diff when
worktree file is missing' '
'
write_script .git/CHECK_SYMLINKS <<\EOF
+readlink() { ls -ld "$1" | sed 's/.* -> //'; }
for f in file file2 sub/sub
do
echo "$f"
--
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