Unix ODBC Installation

The unixODBC Project home page:
http://www.unixodbc.org/
You need unixODBC with Version at least 2.3.0

Check for existing version

Using RedHat Enterprise Linux, Oracle Linux or SuSE Enterprise Linux, you may have installed unixODBC already.
RedHat RHEL 6, Oracle Linux 6 and SuSE SLES 11 provide outdated packages (Version 2.2).
RedHat RHEL 7, Oracle Linux 7 and SuSE SLES 12 come with Version 2.3.

Check for file odbc.ini and for isql

find /etc/ /usr/local/ -type f -name odbc.ini
find /usr/bin /usr/local/bin -type f -name isql

If you find a file /etc/odbc.ini or /etc/unixODBC/odbc.ini, they mostly come from the vendor-supplied rpm package.
If you find a file /usr/local/etc/odbc.ini problably unixODBC was compiled from source.
The file isql will tell you the version. There may be more than one isql on your server. Some other software brings it own isql.

Check Version of unixODBC

/usr/bin/isql --version
# Output should be something like unixODBC 2.3.0

Uninstall old version?

If you find an outdated version, i recommend not to uninstall it because mostly some other packages have dependencies.

Install from source

Download latest version from http://www.unixodbc.org/download.html

Prerequistes for Installation

You need the C Compiler cc and make.

unixODBC Installation

In this example the file unixODBC-2.3.4.tar.gz was copied to the directory /opt

cd /opt
# unpack
tar xf unixODBC-2.3.4.tar.gz
# change to directory
cd unixODBC-2.3.4
# configure the package
./configure --silent
# compile
make
# install: in this step the software is copied to /usr/local/...
make install

For configuration and compilation you do not need root privileges, only for the last step make installyou need root privileges.

Testing the Installation

You cannot test very much, because you still dont have a driver to access a database with unixODBC.

/usr/local/bin/isql --version
# Output should be unixODBC 2.3.4

Next step

To access a database you still need a driver which is specific to the target database.
I will show examples for MS SQL Server, MySQL and Informix.
Access to MS SQL Server Database: FreeTDS Installation
Access to MySQL Database: Connector/ODBC Installation
Access to Informix Database: Informix ODBC Driver Installation