Building On Linux

ToDo-2 Add

• Instructions for building modules
• Instructions for FFmpeg too:

This is the configure command Steve uses for testing/developing:
../configure  --with-lib-preference="local system" --with-ffmpeg="system" --disable-dynamic-loading --with-mod-script-pipe --with-mod-nyq-bench --enable-debug

For a "release build":
../configure  --with-lib-preference="local system" --with-ffmpeg="system" --disable-dynamic-loading

These are instructions for building on Linux The build family of pages: Building On Windows Building On Mac Building On Linux

Instructions in linux/build.txt

These instructions for building on Linux are in linux/build.txt in the Git repo.

We currently have two different sets of instructions for building on Linux. We plan to merge these instructions in time, and then have variations for where they diverge. 2.4.0 was tested with James' instructions with the CMake variation. Simple step-by-step instructions for building on Ubuntu are periodically posted to the Audacity forum.

Python 2

In addition to the listed dependencies and standard build environment, Audacity also requires Python 2 to be installed for building LV2 support.

On Debian / Ubuntu, systems, if Python 2 is not already installed, it may be installed with:

sudo apt-get install python-minimal

Instructions (Used by James on bionic)

Should that be libasound2-dev? I think I just used libasound and it was fine

Instructions for Building on Linux

Fuller instructions that cover:
    * Upgrading to gcc 4.9 on older Ubuntus
    * Optional libraries
can be found on our wiki at http://wiki.audacityteam.org/wiki/Building_On_Linux.

Some prerequisites:

- Audacity requires gcc 4.9 or later to build.

- CMake ( http://www.cmake.org/ ) is required to build the local copy of 
  the libsoxr resampling library used by Audacity.

On a modern Debian distro, e.g. Ubuntu 16.04 (bionic), you would do:

sudo apt-get install build-essential cmake

- libasound and gtk are required. Having gtk2 and gtk3 too  
  may not be required, but compilation works if both are.

- Auto-tools are also needed.

sudo apt-get install libasound libgtk2.0-dev libgtk-3-dev
sudo apt-get install autoconf automake

- Since you will be fetching code from git repositories you 
  will need git.

sudo apt-get install git git-gui gitk


wxWidgets:

 1) Clone wxWidgets and checkout 3.1.1 from the Audacity fork of the 
    wxWidgets project: 
       https://github.com/audacity/wxWidgets/....

    for example
      mkdir ./wxWidgets
      cd ./wxWidgets
      git clone --recurse-submodules https://github.com/audacity/wxWidgets/

    Don't be tempted to use Widgets already installed on Linux because this 
    will typically be a different version and will cause problems.              

    IF you forgot the --recurse-submodules, you can correct that later by:
      git submodule update --init

  2) Follow instructions for building at 
    https://github.com/audacity/wxWidgets/blob/v3.1.1/docs/gtk/install.txt

    So...

    mkdir buildgtk
    cd buildgtk
    ../configure --with-gtk
    make    

  3) Having got this far, it is well worth trying out building some wxWidgets
    examples to confirm that building has worked OK

Audacity:

These are old steps for using automake.  For 2.4.0 onwards we are using CMake
instead.  See later instructions.

  1) Create a 'build' subdirectory under Audacity and change to it.

  2) Now to build Audacity itself.
    Using a build directory (and .. in the command) keeps source and object files
    in separate directories.

    ../configure --with-lib-preference="local system"

    make
    make install  # as root

Optionally use make -j4 rather than just 'make'. With -j4 Audacity may build faster, on machines that have hard disks rather than SSD. The reason is that the processor can make multiple requests to the hard drive, and get on with work on other cores whilst waiting for files to arrive. If you have a browser open and 4Gb or less of RAM, close it, as the browser can hog memory that is needed for a fast build. You'll lose a lot of time to the OS paging memory in and out

CMake Build

From Audacity 2.4.0 we started building Audacity itself using CMake

Instructions for Installing recent CMake on Ubuntu.  

You'll need CMake 3.15 or higher.  These steps were tested with CMake 3.17.1.

1. Check whether you need to upgrade.

  cmake --version

2. Download the cmake install script from kitware https://cmake.org/download/
Get the binary version for linux, the bash script cmake-3.<something>.sh

3. Move it to the directory where you want to install CMake, possibly
/usr/local/bin (you could install it anywhere and then symlink to it)
I used /usr/local/bin so that I would not need to blow away the older copy 
in /usr/bin if it hadn't worked out.

4. Run the script
  sudo chmod +x cmake-3.<something>.sh
  sudo bash cmake-3.<something>.sh

You will answer n (no for an extra subdirectory) and then y.

5. Check that worked

  cmake --version

Then build Audacity

Instructions for Building Audacity using CMake

1. Make a build directory under the audacity git directory.

  cd audacity
  mkdir build-cmake
  cd build-cmake


2. Generate the makefiles

  cmake -DCMAKE_BUILD_TYPE=Release ..

3. Build Audacity 

  cmake --build . 

4. Run

  cd /bin
  ./audacity

About Box Details

The about box should show a git build identifier, if the source was under
git version control.  There will be no such identifier if you built from
the tarball.  Distros which ship a modified Audacity are encouraged to use
git and so to show their own git identifier.

If the about box shows 'debug build' and you actually built a release build, 
this may be because you used wxWidgets with DEBUG_LEVEL of 1 or higher.  
With Audacity 2.4.0 there is an issue on Linux with the Release build 
reporting itself as Debug.  We expect to fix this for the next release.

Detailed Instructions

Steve Daulton. Updated 04Dec2019

Instructions for Building on Linux

Note that for Audacity 2.3.3, "Mod Script Pipe" should be considered to be
a standard part of an Audacity release, rather than as an optional extra.
FFmpeg support should also be enabled if available in the distribution.

Note that only the current release version of the manual is available on-line. It is
therefore highly recommended to fetch the correct version of the manual and install it
on the local machine to ensure that the correct version of the manual is available for the
end user. See notes below for details.


Prerequisites:

1) Repository sources (sources.list) must include source code sources.
2) For MP3 / FFmpeg support, "non-free" repositories may need to be enabled.
3) Root access is required for installation (usually via "sudo").


Required dependencies:
(The package names below are those used by Debian based distributions.)

For Debian / Ubuntu based distributions, these packages may be installed from the
command line with:
   $ sudo apt install <package-name>

build-essential (g++, gcc, libc6-dev, libc-dev, make)
cmake
gcc 4.9 or later (gcc-7 recommended for Debian / Ubuntu)
libsndfile1
libasound2-dev
libgtk2.0-dev
gettext
libid3tag0-dev
libmad0-dev
libsoundtouch-dev
libogg-dev
libvorbis-dev
libflac-dev
libmp3lame0

WxWidgets 3.0 or 3.1 (see note below)

For FFmpeg support (see note below):
libavformat-dev

For Jack Audio System (see note below):
jackd2
libjack-jackd2-dev


Recommended for developers:
git
autoconf
automake
pkg-config
patch
diff-tools
gdb


WxWidgets:
Audacity requires wxWidgets 3.0 or 3.1.
Wxwidgets 3.1.1 source code is available from: https://github.com/audacity/wxWidgets

For Debian / Ubuntu based distributions, the required wxWidgets packages may all be
pulled in with apt at the command line:
   $ sudo apt install libwxgtk3.0


FFmpeg:
The FFmpeg headers included in the Audacity source are rather old. Audacity may be built
with a more recent version if libavformat-dev is installed on the system (recommended),
but dynamic loading must be disabled (see configuration options below).


Jack Audio System:
Audacity can work with either jackd or jackd2.
Unless your Linux distribution runs Jack as the default sound system, it is recommended
to install QJackCtl to provide a convenient way to manage Jack.
End users are advised to read up on Jack if they wish to install it.


Getting the Audacity source code:

The latest release version of Audacity is available from:
https://www.fosshub.com/Audacity.html
This is the recommended version for end users.

For developers, the current development code is available from Github.
Cloning the repository is recommended so that the source tree may easily be kept up to date.
https://github.com/audacity/audacity


Building Audacity:

After cloning or extracting the downloaded source code, open a terminal window and navigate
to the root of the source folder (the folder that contains the 'README.md' file).

Create a build folder and navigate into it
   $ mkdir build
   $ cd build

Configure the build:
For a comprehensive list of configure options, run
   $ ../configure -h

To configure with all standard release features enabled:
   $ ../configure --with-lib-preference="local system" --with-ffmpeg="system" --disable-dynamic-loading --with-mod-script-pipe
Note that additional steps are required for building and installing Mod Script Pipe (see below).


Enabling FFmpeg (included in the "standard" options above):
Most Linux distributions provide a newer version of FFmpeg than is supported by Audacity's
dynamic loading. For FFmpeg support it is therefore necessary to disable dynamic loading:
   $ ../configure --with-lib-preference="local system" --with-ffmpeg="system" --disable-dynamic-loading


Assuming that configure completes without error, you can now build Audacity:
   $ make

If your processor has multiple cores, you may use the -j switch, set to the number of
available cores. This will considerably speed up the build time.
For example, with an 8 core CPU:
   $ make -j8


Building Mod Script Pipe:

Mod Script Pipe provides an API for external scripting languages such as Python, to communicate with Audacity.
Mod Script Pipe may be used with any scripting language that supports named pipes. For more information,
see: https://manual.audacityteam.org/man/scripting.html

IMPORTANT: Modules for Audacity must be built on the same day as Audacity is built.
Audacity must be built with the --with-mod-script-pipe option.

After building Audacity, navigate to the build/lib-src/mod-script-pipe directory:
   $ cd lib-src/mod-script-pipe

Then build Mod Script Pipe (the "-j" switch is available for multi-core CPUs):
   $ make


Fetching the manual:

The Audacity manual is html, and is identical for Windows, Mac and Linux.
For release versions of Audacity, the manual may be downloaded as a ZIP archive from:
Current version: https://www.fosshub.com/Audacity.html
Old versions: https://www.fosshub.com/Audacity-old.html


Pre-installation test:

Create a local folder for Audacity's settings. This folder will be only used for testing and will
not be installed.
   $ mkdir "Portable Settings"

Then launch Audacity
   $ ./audacity


Installing Audacity:

To install the main application, from the build directory:
   $ sudo make install


To install Mod Script Pipe:
Assuming that Audacity has been installed to /usr/local/ (default)
   $ sudo mkdir /usr/local/share/audacity/modules
   $ sudo cp lib-src/mod-script-pipe/.libs/mod-script-pipe.so /usr/local/share/audacity/modules/mod-script-pipe.so
   $ sudo cp lib-src/mod-script-pipe/.libs/mod-script-pipe.so.0.0.0 /usr/local/share/audacity/modules/mod-script-pipe.so.0.0.0
The module will now be available for enabling in Preferences (https://manual.audacityteam.org/man/modules_preferences.html)

Note that it is also possible to install Mod Script Pipe for a single user by copying these two files to:
   ~/.audacity-files/modules


To install the manual:
Assuming that Audacity has been installed to /usr/local/ (default).
From the directory constaining the manual ZIP archive:
   $ sudo unzip audacity-manual-2.3.3.zip -d /usr/local/share/audacity/help

Variations

These instructions for variations on building aren't in linux/build.txt in the Git repo.

gcc 4.9 on Ubuntu 14.04

If you're on Ubuntu 14.04, you need to upgrade the gcc compiler to at least 4.9.

• Upgrade_to_gcc_4.9

 1) export CXX="g++-4.9" CC="gcc-4.9"
 
 2) g++-4.9 --version

You also must tell gcc to use c++11, so adapt the earlier configure command as follows:

    ../configure --with-lib-preference="local system" CXXFLAGS="-std=c++11"

Changes to makefile.am

If you've added or removed source files, you will need to change makefile.am to reflect that.

 autoreconf --no-recursive -i

Options

To see compile-time options you can set, you can type
  ./configure --help

For example you can enable and disable libraries.

Audacity 2.3.0 is now built by default with local ffmpeg and local libFlac.

Cache for Configure

This below is a note/tip from a developer, but untested by us:

If you want to do any development, you might want to generate a configure cache
and header dependencies:

  ./configure -C
  make dep

FFmpeg

Audacity should be able to link dynamically to FFmpeg 1.2 to 2.3.x (libav 0.8 to 10),
but many distributions have more recent versions that fail to link dynamically.
To work around this issue, Audacity may be configured to use the system
FFmpeg library and disable dynamic loading.
   $ ../configure --with-lib-preference="local system" --with-ffmpeg=system --disable-dynamic-loading

If this is done for both FFmpeg and LAME, then the "Libraries" option in Audacity's Preferences is not required and is automatically removed.
   $ ../configure --with-lib-preference="local system" --with-ffmpeg=system  --with-lame=system --disable-dynamic-loading

Other 'make' targets

These are some other make targets.

To uninstall:
   make uninstall #as root

To clean the build after modifying code:
   make clean

To clean and remove previous configure options:
   make distclean

Official Full Releases

Official full releases:

• Executables: Have a GitIdent, visible in the about box build information, that says what branch was used in building.
• Source-Code distros: Are minimal cut down versions from the release branch. We take out system libs that we expect to be provided by the distro, and that we haven't patched.

Updating .po files

With an official release, we ask translators to translate an updated .pot file. We create this with the following script:

cd locale
bash update_po_files.sh

Note: The script has the Audacity version number in it in three places, and all three should be updated before running it.

Updating GitIdent

• We recommend that maintainers of linux distros that ship pre built copies of Audacity build with a GitIdent that reflects the state of their version of the branch including their patches to it.
• We don't recommend having a Git ident when distributing in source code form, and we don't either in our

tarballs.

 git show -s --format="#define REV_LONG \"%H\"%n#define REV_TIME \"%cd\"%n" | tee ../src/RevisionIdent.h
 or easier use ../mac/get_gitident.sh

The CMake build adds the gitident automatically and this step is only needed with the automake builds.

Making a Minimal Tarball

eventually we will retire the page below and have a much shorter version right here

• Building Release Tarballs

If using CMake build (you should use it!)

make minsrc

If using Autotools buildchain

 Clean your copy.  You check using -n and clean with -f.

 git clean -x -d -n
 git clean -x -d -f

 Now configure as if for building:

 ./configure --with-lib-preference="local system"

 Run the make tarball script:

 ./scripts/maketarball.sh verbose 

  Check the tarball is good for building:

  cd ../audacity-minsrc-x.y.z
  ./configure --with-lib-preference="local system"
  make -j4