unikernel/duniverse/dune_/example/with-configure-step.t/run.t

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+This example creates a configuration file using a fallback rule.
+See README.org for details
+
+By default, config is set:
+
+  $ dune exec ./src/plop.exe
+  Built with support for blah: true
+  Path to blah is:             "/path/to/blah"
+
+Print generated config:
+
+  $ cat _build/default/config.full
+  
+  let with_blah = true
+  let blah_path = "/path/to/blah"
+
+Now, we disable it, and re-run:
+
+  $ echo "let enable_blah = No" > config
+  $ dune exec ./src/plop.exe
+  Built with support for blah: false
+  Path to blah is:             "<no support for blah>"
+  $ cat _build/default/config.full
+  
+  let with_blah = false
+  let blah_path = "<no support for blah>"