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Ideas for wrapper

Hi, I was looking for Graphviz FFI too and came across the JavaScript EMSCRIPTEN bindings, check it out here:

https://github.com/mdaines/viz-js/blob/v3/packages/viz/src/module/viz.c

Update bindgen version

Hi! Thanks for the crate :)

Do you mind updating to a new bindgen version in crates.io? The one currently used is yanked.
Thanks

How to use the crate?

Hi! Maybe I am doing something really wrong since I have never used ffi in Rust...

I wanted to run the README example in my computer and I have the following error when compiling.

   Compiling graphviz-ffi v0.1.2
error: failed to run custom build command for `graphviz-ffi v0.1.2`

Caused by:
  process didn't exit successfully: `C:\Users\rsaonaur\projects\knowledge\target\debug\build\graphviz-ffi-b606b415f266dceb\build-script-build` (exit code: 101)
  --- stdout
  cargo:rustc-link-lib=gvc
  cargo:rustc-link-lib=cgraph

  --- stderr
  thread 'main' panicked at 'Unable to find libclang: "couldn't find any valid shared libraries matching: ['clang.dll', 'libclang.dll'], set the `LIBCLANG_PATH` environment variable to a path where one of these files can be found (invalid: [])"', C:\Users\rsaonaur\.cargo\registry\src\github.com-1ecc6299db9ec823\bindgen-0.59.1\src/lib.rs:2117:31
  note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

I am not sure what it means :/
Do I have to install libclang before using this crate?
Maybe I have to obtain gvc and cgraph from graphviz to make the link?

Again, sorry if this is a very basic question.

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