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Building via qmake

The following commands assume the following environment variables are set:

$srcdir: The directory into which the source has been downloaded and unpacked.
_qtver: The Qt version being used (eg: 5.6.0).
$pkgdir: The directory into which installable files are places. This is / for local installations, or can be different directory when preparing a redistributable package.

Either set them accordingly, or replace them in the below commands as desired.

The following sources should be downloaded and unpacked into $srcdir:

This repository (either master or a specific tag).
git clone git://code.qt.io/qt/qt5.git
git clone git+https://chromium.googlesource.com/breakpad/breakpad breakpad
git clone git+https://chromium.googlesource.com/linux-syscall-support breakpad-lss
telegramdesktop.desktop (The intention is to include this file inside the source package at some point): https://aur.archlinux.org/cgit/aur.git/plain/telegramdesktop.desktop?h=telegram-desktop
tg.protocol: https://aur.archlinux.org/cgit/aur.git/plain/tg.protocol?h=telegram-desktop

Preparation

cd "$srcdir/tdesktop"

mkdir -p "$srcdir/Libraries"

local qt_patch_file="$srcdir/tdesktop/Telegram/Patches/qtbase_${_qtver//./_}.diff"
local qt_dir="$srcdir/Libraries/qt${_qtver//./_}"
if [ "$qt_patch_file" -nt "$qt_dir" ]; then
  rm -rf "$qt_dir"
  git clone git://code.qt.io/qt/qt5.git
  cd "$qt_dir"
  git checkout 5.6
  perl init-repository --module-subset=qtbase,qtimageformats
  git checkout v$_qtver
  cd qtimageformats
  git checkout v$_qtver
  cd ../qtbase
  git checkout v$_qtver
  git apply "$qt_patch_file"
fi

if [ ! -h "$srcdir/Libraries/breakpad" ]; then
  ln -s "$srcdir/breakpad" "$srcdir/Libraries/breakpad"
  ln -s "$srcdir/breakpad-lss" "$srcdir/Libraries/breakpad/src/third_party/lss"
fi

sed -i 's/CUSTOM_API_ID//g' "$srcdir/tdesktop/Telegram/Telegram.pro"

(
  echo "DEFINES += TDESKTOP_DISABLE_AUTOUPDATE"
  echo "DEFINES += TDESKTOP_DISABLE_REGISTER_CUSTOM_SCHEME"
) >> "$srcdir/tdesktop/Telegram/Telegram.pro"

Building

# Build patched Qt
cd "$srcdir/Libraries/QtStatic"
./configure -prefix "$srcdir/qt" -release -opensource -confirm-license -qt-zlib \
            -qt-libpng -qt-libjpeg -qt-freetype -qt-harfbuzz -qt-pcre -qt-xcb \
            -qt-xkbcommon-x11 -no-opengl -no-gtkstyle -static -nomake examples -nomake tests
make module-qtbase module-qtimageformats
make module-qtbase-install_subtargets module-qtimageformats-install_subtargets

export PATH="$srcdir/qt/bin:$PATH"

# Build breakpad
cd "$srcdir/Libraries/breakpad"
./configure
make

# Build codegen_style
mkdir -p "$srcdir/tdesktop/Linux/obj/codegen_style/Debug"
cd "$srcdir/tdesktop/Linux/obj/codegen_style/Debug"
qmake CONFIG+=debug ../../../../Telegram/build/qmake/codegen_style/codegen_style.pro
make

# Build codegen_numbers
mkdir -p "$srcdir/tdesktop/Linux/obj/codegen_numbers/Debug"
cd "$srcdir/tdesktop/Linux/obj/codegen_numbers/Debug"
qmake CONFIG+=debug ../../../../Telegram/build/qmake/codegen_numbers/codegen_numbers.pro
make

# Build MetaLang
mkdir -p "$srcdir/tdesktop/Linux/DebugIntermediateLang"
cd "$srcdir/tdesktop/Linux/DebugIntermediateLang"
qmake CONFIG+=debug "../../Telegram/MetaLang.pro"
make

# Build Telegram Desktop
mkdir -p "$srcdir/tdesktop/Linux/ReleaseIntermediate"
cd "$srcdir/tdesktop/Linux/ReleaseIntermediate"

qmake CONFIG+=release "../../Telegram/Telegram.pro"
make

Installation

install -dm755 "$pkgdir/usr/bin"
install -m755 "$srcdir/tdesktop/Linux/Release/Telegram" "$pkgdir/usr/bin/telegram-desktop"

install -d "$pkgdir/usr/share/applications"
install -m644 "$srcdir/telegramdesktop.desktop" "$pkgdir/usr/share/applications/telegramdesktop.desktop"

install -d "$pkgdir/usr/share/kde4/services"
install -m644 "$srcdir/tg.protocol" "$pkgdir/usr/share/kde4/services/tg.protocol"

local icon_size icon_dir
for icon_size in 16 32 48 64 128 256 512; do
  icon_dir="$pkgdir/usr/share/icons/hicolor/${icon_size}x${icon_size}/apps"

  install -d "$icon_dir"
  install -m644 "$srcdir/tdesktop/Telegram/SourceFiles/art/icon${icon_size}.png" "$icon_dir/telegram-desktop.png"
done

Notes

These instructions are based on the ArchLinux package for telegram-desktop.

In case these instructions are at some point out of date, the above may serve as an update reference.

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