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Add --locked Flag to Cargo Install Instructions #335

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8 changes: 4 additions & 4 deletions README.md
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Expand Up @@ -54,22 +54,22 @@ Finally, installing the correct nightly Rust compiler with [Rustup](https://rust

### Installing from crates.io

cargo +nightly-2019-12-05 install c2rust
cargo +nightly-2019-12-05 install c2rust --locked

On OS X with Homebrew LLVM, you need to point the build system at the LLVM installation as follows:

LLVM_CONFIG_PATH=/usr/local/opt/llvm/bin/llvm-config cargo +nightly-2019-12-05 install c2rust
LLVM_CONFIG_PATH=/usr/local/opt/llvm/bin/llvm-config cargo +nightly-2019-12-05 install c2rust --locked

On Linux with Linuxbrew LLVM, you need to point the build system at the LLVM installation as follows:

LLVM_CONFIG_PATH=/home/linuxbrew/.linuxbrew/opt/llvm/bin/llvm-config cargo +nightly-2019-12-05 install c2rust
LLVM_CONFIG_PATH=/home/linuxbrew/.linuxbrew/opt/llvm/bin/llvm-config cargo +nightly-2019-12-05 install c2rust --locked

Note: adjust `LLVM_CONFIG_PATH` accordingly if Linuxbrew was installed to your home directory.

On Gentoo, you need to point the build system to the location of `libclang.so`
and `llvm-config` as follows:

LLVM_CONFIG_PATH=/path/to/llvm-config LIBCLANG_PATH=/path/to/libclang.so cargo +nightly-2019-12-05 install c2rust
LLVM_CONFIG_PATH=/path/to/llvm-config LIBCLANG_PATH=/path/to/libclang.so cargo +nightly-2019-12-05 install c2rust --locked


If you have trouble with building and installing, or want to build from the latest master, the [developer docs](docs/README-developers.md#building-with-system-llvm-libraries) provide more details on the build system.
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