Cannot compile on Arch Linux due to missing swig.

[ghost]

I installed bazel from the AUR, succesfully, created an empty project with tensorflow = "*" as the only dependency, did a cargo build -j 1 and this is the output.

ivegotasthma@dev irekt $ cargo build -j 1
    Updating registry `https://github.com/rust-lang/crates.io-index`
 Downloading tensorflow v0.1.0
 Downloading tensorflow-sys v0.5.0
 Downloading num-complex v0.1.35
   Compiling num-traits v0.1.36
   Compiling num-complex v0.1.35
   Compiling libc v0.2.17
   Compiling pkg-config v0.3.8
   Compiling tensorflow-sys v0.5.0
error: failed to run custom build command for `tensorflow-sys v0.5.0`
process didn't exit successfully: `/home/ivegotasthma/work/projects/irekt/target/debug/build/tensorflow-sys-f5d6b3977d411f10/build-script-build` (exit code: 101)
--- stdout
libtensorflow-sys/build.rs:31: output = "/home/ivegotasthma/work/projects/irekt/target/debug/build/tensorflow-sys-f5d6b3977d411f10/out"
libtensorflow-sys/build.rs:33: source = "/home/ivegotasthma/.cargo/registry/src/github.com-1ecc6299db9ec823/tensorflow-sys-0.5.0/target/source-0.10.0"
libtensorflow-sys/build.rs:35: lib_dir = "/home/ivegotasthma/work/projects/irekt/target/debug/build/tensorflow-sys-f5d6b3977d411f10/out/lib-0.10.0"
libtensorflow-sys/build.rs:39: Creating directory "/home/ivegotasthma/work/projects/irekt/target/debug/build/tensorflow-sys-f5d6b3977d411f10/out/lib-0.10.0"
libtensorflow-sys/build.rs:43: library_path = "/home/ivegotasthma/work/projects/irekt/target/debug/build/tensorflow-sys-f5d6b3977d411f10/out/lib-0.10.0/libtensorflow_c.so"
libtensorflow-sys/build.rs:48: target_path = "tensorflow/libtensorflow_c.so"
libtensorflow-sys/build.rs:102: Executing "git" "clone" "--branch=v0.10.0" "--recursive" "https://github.com/tensorflow/tensorflow.git" "/home/ivegotasthma/.cargo/registry/src/github.com-1ecc6299db9ec823/tensorflow-sys-0.5.0/target/source-0.10.0"
libtensorflow-sys/build.rs:106: Command "git" "clone" "--branch=v0.10.0" "--recursive" "https://github.com/tensorflow/tensorflow.git" "/home/ivegotasthma/.cargo/registry/src/github.com-1ecc6299db9ec823/tensorflow-sys-0.5.0/target/source-0.10.0" finished successfully
libtensorflow-sys/build.rs:77: Checking build file "/home/ivegotasthma/.cargo/registry/src/github.com-1ecc6299db9ec823/tensorflow-sys-0.5.0/target/source-0.10.0/tensorflow/BUILD"
libtensorflow-sys/build.rs:84: Patching build file "/home/ivegotasthma/.cargo/registry/src/github.com-1ecc6299db9ec823/tensorflow-sys-0.5.0/target/source-0.10.0/tensorflow/BUILD"
libtensorflow-sys/build.rs:102: Executing "./configure"
No Google Cloud Platform support will be enabled for TensorFlow
Can't find swig.  Ensure swig is in $PATH or set $SWIG_PATH.

--- stderr
Cloning into '/home/ivegotasthma/.cargo/registry/src/github.com-1ecc6299db9ec823/tensorflow-sys-0.5.0/target/source-0.10.0'...
Note: checking out 'c715c3102df1556fc0ce88fc987440a3c80e5380'.

You are in 'detached HEAD' state. You can look around, make experimental
changes and commit them, and you can discard any commits you make in this
state without impacting any branches by performing another checkout.

If you want to create a new branch to retain commits you create, you may
do so (now or later) by using -b with the checkout command again. Example:

  git checkout -b <new-branch-name>

thread 'main' panicked at 'failed to execute "./configure"', /home/ivegotasthma/.cargo/registry/src/github.com-1ecc6299db9ec823/tensorflow-sys-0.5.0/build.rs:104
note: Run with `RUST_BACKTRACE=1` for a backtrace.

ivegotasthma@dev irekt $ 

[adamcrume]

Is SWIG installed? If not, install SWIG and try again. If it still doesn't work, make sure swig is on the $PATH.

[ghost]

@adamcrume compiles successfully with swig installed, would be worth while to mention this in the README

[adamcrume]

I updated the README.