Install C compiler

You need to install the command line developer tools or the Xcode. (The latter includes the former.)

Run "cc --version" in a terminal to check whether they are installed.

If the cc version is printed, the tools are installed.

If the follwoing dialog is displayed, click its Install button to install the tools. You have no need to install the Xcode to compile ruby-oci8. It requires command line tools, not an IDE such as the Xcode.

dialog

If "Agreeing to the Xcode/iOS license requires admin privileges, please re-run as root via sudo." is printed, you need to run "sudo cc --version", enter your password, look at the license and type "agree".

Install Oracle Instant Client Packages

Download Oracle Instant Client Packages

Download the following packages from Oracle Technology Network

Instant Client Package - Basic (instantclient-basic-macos.x64-12.1.0.2.0.zip) or Basic Lite (instantclient-basiclite-macos.x64-12.1.0.2.0.zip)
Instant Client Package - SDK (instantclient-sdk-macos.x64-12.1.0.2.0.zip)
Instant Client Package - SQL*Plus (instantclient-sdk-macos.x64-12.1.0.2.0.zip) (optionally)

Install Oracle Instant Client Packages via Homebrew

To install Oracle Instant Client Basic via Homebrew

Copy downloaded zip files to /Library/Caches/Homebrew (if the environment variable HOMEBREW_CACHE is not set and $HOME/Library/Caches/Homebrew doesn't exist.)

Run the followining commands:

brew tap InstantClientTap/instantclient
brew install instantclient-basic
brew install instantclient-sdk
brew install instantclient-sqlplus # (optionally)

Set the environment variable OCI_DIR while performing the following installation steps if Homebrew is installed outside /usr/local.
```
export OCI_DIR=$(brew --prefix)/lib
```

To install Oracle Instant Client Basic Lite via Homebrew

Copy downloaded zip files to /Library/Caches/Homebrew (if the environment variable HOMEBREW_CACHE is not set and $HOME/Library/Caches/Homebrew doesn't exist.)

Run the followining commands:

brew tap InstantClientTap/instantclient
brew install instantclient-basiclite
brew install instantclient-sdk
brew install instantclient-sqlplus --with-basiclite # (optionally)

Set the environment variable OCI_DIR while performing the following installation steps if Homebrew is installed outside /usr/local.
```
export OCI_DIR=$(brew --prefix)/lib
```

Install Oracle Instant Client Manually

If you don't use Homebrew, do the following:

Unzip the packages as follows:

mkdir -p /opt/oracle
cd /opt/oracle

Copy downloaded files to /opt/oracle before running the following commands.

unzip instantclient-basic-macos.x64-12.1.0.2.0.zip
unzip instantclient-sdk-macos.x64-12.1.0.2.0.zip
unzip instantclient-sqlplus-macos.x64-12.1.0.2.0.zip

Make a symbolic link to link the library.

cd /opt/oracle/instantclient_12_1
ln -s libclntsh.dylib.12.1 libclntsh.dylib

Set the environment variable OCI_DIR while performing the following installation steps.

export OCI_DIR=/opt/oracle/instantclient_12_1

Installation

If you get a problem in the following steps, look at report-installation-issue.

gem package

Run the following command.

gem install ruby-oci8

tar.gz package

Download the source code

Download the latest tar.gz package from download page.

Run make and install

tar xvfz ruby-oci8-VERSION.tar.gz
cd ruby-oci8-VERSION
make
make install