OpenSSL crate fails compilation on Mac OS X 10.11

Question

I tried to install the Iron framework for Rust on Mac OS X 10.11.2, but it failed when I run cargo build or cargo run on compiling openssl

Answer 1

https://stackoverflow.com/a/39380733/1317564's answer for MacPorts:

sudo port install openssl
export OPENSSL_INCLUDE_DIR=/opt/local/include
export OPENSSL_LIB_DIR=/opt/local/lib
cargo clean
cargo build