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Try to install camlp5 with latest version of ocaml delete everything on the file system #11440
I'm not familiar with the internal mechanics of opam install. But it seems like the camlp5 is not compatible with ocaml 4.06.1, and it complains about it during configuration. As a result, several variables is not set in the Makefile. The opam will execute "make uninstall" then which essentially runs "rm -rf /" on my computer.
For the story, this happened to me a long time ago (exactly the same: undefined variable in a Makefile resulting in