Build failure is on darwin, which looks to be timing out building rust. Not sure that rust works on darwin via nixpkgs anyway?

Maybe simply disable the MacOS port? i.e. set the platforms attribute to platforms.linux.

Actually maybe it's just that rust isn't built for darwin on Hydra?

Anyway, cc maintainer @Ralith .

While looking at this:

Should 'bindgen' be wrapped to set LIBCLANG_PATH if not already set? Not sure what makes the most sense here. Without this the resulting 'bindgen' binary can't be executed (even trying "bindgen --help").

Looks like the current version (0.22.1) has this problem, but not the version in 17.03 (0.19.1).

Weird, they must have switched to dlopen for some reason. A wrapper seems reasonable to me. I wouldn't bother trying to pass through an externally set LIBCLANG_PATH.

Note that, per the comment I left in default.nix, an ideal wrapper script would also inject $NIX_CFLAGS_COMPILE so includes work. It'd be great to fix that while you're at it. This is a little tricky (requires some argument parsing) because if the user passes -- ... explicitly, then the real binary needs to be invoked with -- $NIX_CFLAGS_COMPILE ... so as not to duplicate the -- and also avoid inadvertently clobbering flags.