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- Appendix G: Building NSIS

- Building in General
- Building on Windows
- Building on POSIX
- Nightly Builds

# Appendix G: Building NSIS

NSIS version 2.07 introduced a new build system, based on SCons. The build system can build the entire NSIS package so there is no longer need to build it project by project. It allows building using several simultaneous jobs, installation without an installer on both Windows and POSIX and easy compilation with debugging symbols.

## G.1 Building in General

Source code is available in SVN and as a separate package with every NSIS distribution. The source code for the Unicode version of the installer can be found here.

To build NSIS Python and SCons must be installed. Currently, the supported version of SCons is version 0.96.93. Any version of Python above 1.6 is supported.

To build, open a console, change the working directory to the root directory of NSIS and type `scons`. That's it. For example:

    C:\>cd dev\nsis
    C:\dev\nsis>scons
    scons: Reading SConscript files ...
    Using Microsoft tools configuration
    Checking for main() in C library gdi32... (cached) yes
    Checking for main() in C library user32... (cached) yes
    Checking for main() in C library version... (cached) yes
    Checking for main() in C library pthread... (cached) no
    Checking for main() in C library stdc++... (cached) no
    Checking for main() in C library iconv... (cached) no
    Checking for main() in C library libiconv... (cached) no
    scons: done reading SConscript files.
    scons: Building targets ...
    ...

To install the built files, type:

    scons PREFIX="C:\Program Files\NSIS" install

To create an installer (only on Windows), type:

    scons dist-installer

To create a distribution zip file, type:

    scons dist-zip

To create both, type:

    scons dist

To get a complete list of options that the build system has to offer, type:

    scons -h

To get a complete list of options SCons has to offer, type:

    scons -H

## G.2 Building on Windows

SCons will automatically detect Microsoft Visual C++. If you are looking for a free compiler to compile NSIS, we recommend Microsoft Visual C++ 2005 Express Edition.

When using the Microsoft Visual C++ Toolkit 2003, add MSTOOLKIT=yes to the build command line:

    scons MSTOOLKIT=yes

In case of errors about the compiler or the Platform SDK not being found, use:

    set MSSDK=C:\Path\To\Platform SDK
    set VCToolkitInstallDir=C:\Path\To\VCToolkit
    scons MSTOOLKIT=yes

The open-source MinGW can also be used to for building, but this results in noticeably larger installers. Borland C++ or Open Watcom C/C++ might also work, but haven't been tested.

To compile the documentation as a CHM file, hhc.exe must be in the PATH. It is available as part of HTML Help Workshop.

To build NSIS Menu, install wxWidgets 2.8, create an environment variable named `WXWIN` containing the path to the installation directory of wxWidgets, run `Contrib\NSIS Menu\wx\wxbuild.bat` and build NSIS as usual.

Important notes for Microsoft Visual C++ 6.0 users: The latest Platform SDK must be installed before building. Because of flaws in the libraries distributed with Microsoft Visual C++ 6.0, not installing the Platform SDK will result in crashes when using the CopyFiles command. See this forum topic for more information. Installing the Processor Pack is highly recommended to decrease the size of the installer overhead.

## G.3 Building on POSIX

As of NSIS 2.01, the compiler, makensis, also compiles on POSIX platforms. POSIX platforms include Linux, *BSD, Mac OS X and others. Since the generated installer will eventually run on Windows, a cross-compiler is needed in order to compile them.

If no cross-compiler is available, use the following:

    scons SKIPSTUBS=all SKIPPLUGINS=all SKIPUTILS=all SKIPMISC=all
          NSIS_CONFIG_CONST_DATA_PATH=no PREFIX=/path/to/extracted/zip
          install-compiler

    scons NSIS_CONFIG_CONST_DATA_PATH=no PREFIX=/path/to/extracted/zip
          /path/to/extracted/zip/LibraryLocal

This should only build makensis and install it to the directory where a precompiled package, such as the nightly build or a zipped release version (nsis-x.xx.zip), is extracted. Note that the in order for this to work, the precompiled package must be compiled using the exact same sources as makensis. In particular, `Source\exehead\config.h`, the options passed to scons and `Source\exehead\fileform.h` must be identical. Nightly builds and zipped release versions are built with the default options.

To build a native version of NSIS Menu, install wxWidgets 2.8 and build as usual. `wx-config` must be in the path.

## G.4 Nightly Builds

There is no need to manually build the latest SVN version for Windows. A nightly build is available. The nightly build is automatically generated every night, using the latest version of the source code from SVN. There is no official nightly build for other platforms.

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