1.3. Building and Installing SCons on Any System

If a pre-built SCons package is not available for your system, then you can still easily build and install SCons using the native Python distutils package.

The first step is to download either the scons-1.3.1.tar.gz or scons-1.3.1.zip, which are available from the SCons download page at http://www.scons.org/download.html.

Unpack the archive you downloaded, using a utility like tar on Linux or UNIX, or WinZip on Windows. This will create a directory called scons-1.3.1, usually in your local directory. Then change your working directory to that directory and install SCons by executing the following commands:

      # cd scons-1.3.1
      # python setup.py install

This will build SCons, install the scons script in the python which is used to run the setup.py's scripts directory (/usr/local/bin or C:\Python25\Scripts), and will install the SCons build engine in the corresponding library directory for the python used (/usr/local/lib/scons or C:\Python25\scons). Because these are system directories, you may need root (on Linux or UNIX) or Administrator (on Windows) privileges to install SCons like this.

1.3.1. Building and Installing Multiple Versions of SCons Side-by-Side

The SCons setup.py script has some extensions that support easy installation of multiple versions of SCons in side-by-side locations. This makes it easier to download and experiment with different versions of SCons before moving your official build process to a new version, for example.

To install SCons in a version-specific location, add the --version-lib option when you call setup.py:

        # python setup.py install --version-lib

This will install the SCons build engine in the /usr/lib/scons-1.3.1 or C:\Python25\scons-1.3.1 directory, for example.

If you use the --version-lib option the first time you install SCons, you do not need to specify it each time you install a new version. The SCons setup.py script will detect the version-specific directory name(s) and assume you want to install all versions in version-specific directories. You can override that assumption in the future by explicitly specifying the --standalone-lib option.

1.3.2. Installing SCons in Other Locations

You can install SCons in locations other than the default by specifying the --prefix= option:

        # python setup.py install --prefix=/opt/scons

This would install the scons script in /opt/scons/bin and the build engine in /opt/scons/lib/scons,

Note that you can specify both the --prefix= and the --version-lib options at the same type, in which case setup.py will install the build engine in a version-specific directory relative to the specified prefix. Adding --version-lib to the above example would install the build engine in /opt/scons/lib/scons-1.3.1.

1.3.3. Building and Installing SCons Without Administrative Privileges

If you don't have the right privileges to install SCons in a system location, simply use the --prefix= option to install it in a location of your choosing. For example, to install SCons in appropriate locations relative to the user's $HOME directory, the scons script in $HOME/bin and the build engine in $HOME/lib/scons, simply type:

        $ python setup.py install --prefix=$HOME

You may, of course, specify any other location you prefer, and may use the --version-lib option if you would like to install version-specific directories relative to the specified prefix.

This can also be used to experiment with a newer version of SCons than the one installed in your system locations. Of course, the location in which you install the newer version of the scons script ($HOME/bin in the above example) must be configured in your PATH variable before the directory containing the system-installed version of the scons script.