i2pd_docs_en/docs/devs/building/qt-desktop-gui.md

Qt Desktop GUI build instructions

Build Requirements

Qt 5 is necessary (because Qt 4 lacks QtWidgets folder).

Under Windows

With Qt Creator

Instructions are not known.

Without Qt Creator

All commands should be run under MSYS2 mingw32.

pacman -S git make tar mingw-w64-i686-gcc mingw-w64-i686-boost mingw-w64-i686-libpng mingw-w64-i686-openssl mingw-w64-i686-zlib
pacman -S mingw-w64-i686-qt5-static
pacman -S openssl-devel mingw-w64-i686-miniupnpc
mkdir -p /c/dev/
cd /c/dev/
git clone https://github.com/PurpleI2P/i2pd.git
cd i2pd
git checkout openssl
export MINGW='mingw32'
export PATH=/$MINGW/bin:/usr/bin:/mingw32/qt5-static/bin
cd qt/i2pd_qt
qmake
make USE_UPNP=yes

Caveats

It is important to restrict PATH as described above. If you have Strawberry Perl and/or Mercurial installed, it will pick up gcc & openssl from the wrong places.

If you are an Arch Linux user, refrain from updating system with pacman -Syu. Always update runtime separately as described on the home page, otherwise you might end up with DLLs incompatibility problems.

Under Ubuntu

With Qt Creator

sudo apt install qtcreator qt5-default build-essential g++ make libcrypto++-dev \
  libssl-dev libboost-all-dev libminiupnpc-dev libwebsocketpp-dev libqt5gui5 git \
  zlib1g-dev
mkdir git
cd git
git clone --recursive https://github.com/PurpleI2P/i2pd-qt.git

Then, open Qt Creator; open git/i2pd-qt/i2pd_qt.pro; set build make parameter -jNUMBER-OF-CPU-CORES, e.g. -j7. Then, finally, press Make button.

Without Qt Creator

sudo apt-get install build-essential g++ make libcrypto++-dev libssl-dev \
  libboost-all-dev libminiupnpc-dev libwebsocketpp-dev qt5-default \
  libqt5gui5 git zlib1g-dev
mkdir git
cd git
git clone --recursive https://github.com/PurpleI2P/i2pd-qt.git
cd i2pd-qt

For release build,

qmake

For debug build,

qmake i2pd_qt.pro "CONFIG += debug"

And when qmake completed, run:

make USE_UPNP=yes

Under Kali

Without Qt Creator

sudo apt-get install build-essential g++ make libcrypto++-dev libssl-dev \
  libboost-all-dev libminiupnpc-dev libwebsocketpp-dev qtbase5-dev \
  libqt5gui5 git zlib1g-dev
mkdir git
cd git
git clone --recursive https://github.com/PurpleI2P/i2pd-qt.git
cd i2pd-qt

For release build,

qmake

For debug build,

qmake i2pd_qt.pro "CONFIG += debug"

And when qmake completed, run:

make USE_UPNP=yes

Building a Flatpak package

sudo apt install flatpak flatpak-builder
flatpak --user remote-add --if-not-exists flathub https://flathub.org/repo/flathub.flatpakrepo
flatpak --user install flathub org.kde.Sdk/x86_64/5.14     # required SDK version might be higher, check the manifest at https://github.com/flathub/website.i2pd.i2pd/blob/master/website.i2pd.i2pd.json
git clone https://github.com/flathub/website.i2pd.i2pd && cd website.i2pd.i2pd 
export FLATPAK_BUILDER_N_JOBS=4                            # build process jobs count
flatpak-builder --user --install --force-clean i2pd_build_dir website.i2pd.i2pd.json

More details

For more details on build procedures, see the GitHub actions at https://github.com/PurpleI2P/i2pd-qt/tree/master/.github/workflows .