/usr/lib/flatpak/installed-tests/flatpak-builder/empty-configure is in flatpak-builder-tests 0.10.9-1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 | #!/bin/sh
cat <<EOF > Makefile
all:
echo Building
install:
echo Installing
EOF
|