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GUI Application for FreeDV – open source digital voice for HF radio


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Building FreeDV GUI

This document describes how to build the FreeDV GUI program for various operating systems. FreeDV GUI is developed on Ubuntu Linux, and then cross compiled for Windows using Fedora Linux (Fedora has great cross compiling support) and Docker.

Further Reading

Building on Ubuntu Linux

$ sudo apt install libspeexdsp-dev libsamplerate0-dev sox git \
libwxgtk3.2-dev libhamlib-dev libasound2-dev libao-dev \
libgsm1-dev libsndfile1-dev cmake module-assistant build-essential
$ git clone
$ cd freedv-gui

(if using pipewire/PulseAudio -- recommended and the default) 
$ sudo apt install libpulse-dev
$ ./

(if using PortAudio)
$ sudo apt install portaudio19-dev
$ ./ portaudio

(Depending on release you may need to use libwxgtk3.0-gtk3-dev instead of libwxgtk3.2-dev.)

Then run with:

$ ./build_linux/src/freedv

Note this builds all libraries locally, nothing is installed on your machine. make install is not required.

Building on Fedora Linux

$ sudo dnf groupinstall "Development Tools"
$ sudo dnf install cmake wxGTK3-devel libsamplerate-devel \
  libsndfile-devel speexdsp-devel hamlib-devel alsa-lib-devel libao-devel \
  gsm-devel gcc-c++ sox
$ git clone
$ cd freedv-gui

(if using pipewire/PulseAudio -- default and recommended)
$ sudo dnf install pulseaudio-libs-devel
$ ./

(if using PortAudio)
$ sudo dnf install portaudio-devel
$ ./ portaudio

Then run with:

$ ./build_linux/src/freedv

Building without LPCNet

In preparation for possible future deprecation of FreeDV 2020 and 2020B modes, it is possible to build without requiring the LPCNet library. To do this, pass LPCNET_DISABLE=1 as an environment variable to the build script, i.e.


or alternatively, do not pass in LPCNET_BUILD_DIR to cmake if manually executing the build. This also has the side effect of disabling 2020 and 2020B in the user interface, preventing either from being selected.

Note: if you don't already have Codec2 installed on your machine, you will need to pass -DBOOTSTRAP_LPCNET=1 to cmake in order for LPCNet to also be built.

Installing on Linux

You need to install the codec2 and lpcnetfreedv shared libraries, and freedv-gui:

$ cd ~/freedv-gui/codec2/build_linux
$ sudo make install
$ cd ~/freedv-gui/LPCNet/build_linux
$ sudo make install
$ cd ~/freedv-gui/build_linux
$ sudo make install
$ sudo ldconfig


The wav directory contains test files of modulated audio that you can use to test FreeDV (see the USER_MANUAL).

Building for Windows

Windows releases are built using the LLVM version of MinGW. This allows one to build FreeDV for ARM as well as for Intel Windows systems, including support for 2020 mode (on systems fast enough to acceptably decode it).


  • CMake >= 3.25.0
  • Linux (tested on Ubuntu 22.04)
    • NOTE: This does not currently work on macOS due to CMake using incorrect library suffixes.
  • NSIS for generating the installer (for example, sudo apt install nsis on Ubuntu)


  1. Download LLVM MinGW at
  2. Decompress into your preferred location. For example: tar xvf llvm-mingw-20220906-ucrt-ubuntu-18.04-x86_64.tar.xz (The exact filename here will depend on the file downloaded in step (1). Note that for best results, you should use a build containing "ucrt" in the file name corresponding to the platform which you're building the Windows binary from.)
  3. Add LLVM MinGW to your PATH: export PATH=/path/to/llvm-mingw-20220906-ucrt-ubuntu-18.04-x86_64/bin:$PATH. (The folder containing the LLVM tools is typically named the same as the file downloaded in step (2) minus the extension.)
  4. Create a build folder inside freedv-gui: mkdir build_windows
  5. Run CMake to configure the FreeDV build: cd build_windows && cmake -DCMAKE_TOOLCHAIN_FILE=${PWD}/../cross-compile/freedv-mingw-llvm-[architecture].cmake ..
    • Valid architectures are: aarch64 (64 bit ARM), i686 (32 bit Intel/AMD), x86_64 (64 bit Intel/AMD)
  6. Build FreeDV as normal: make (You can also add -j[num] to the end of this command to use multiple cores and shorten the build time.)
  7. Create FreeDV installer: make package

Known Issues

  • NSIS-related issues:
    • ARM installers will not properly register in Windows despite installing properly. You can still run the application manually by navigating to C:\Program Files\FreeDV [version]\ using File Explorer and double-clicking on freedv.exe.

Building and installing on macOS

Using MacPorts, most of the appropriate dependencies can be installed by:

$ sudo port install automake git libtool sox +universal cmake

and on Homebrew:

$ brew install automake libtool git sox cmake

Once the dependencies are installed, you can then run the script inside the source tree to build FreeDV and associated libraries (codec2, LPCNet, hamlib). A app bundle will be created inside the build_osx/src folder which can be copied to your system's Applications folder.