Index: PKGBUILD
===================================================================
--- PKGBUILD	(revision 1391892)
+++ PKGBUILD	(working copy)
@@ -2,40 +2,80 @@
 # Contributor: hexchain <i@hexchain.org>
 pkgname=telegram-desktop
 pkgver=4.5.3
-pkgrel=1
+_qtver=6.4.2
+pkgrel=2
 pkgdesc='Official Telegram Desktop client'
 arch=('x86_64')
 url="https://desktop.telegram.org/"
 license=('GPL3')
 depends=('hunspell' 'ffmpeg' 'hicolor-icon-theme' 'lz4' 'minizip' 'openal' 'ttf-opensans'
-         'qt6-imageformats' 'qt6-svg' 'qt6-wayland' 'qt6-5compat' 'xxhash' 'glibmm-2.68'
-         'rnnoise' 'pipewire' 'libxtst' 'libxrandr' 'jemalloc' 'abseil-cpp' 'libdispatch'
-         'openssl-1.1' 'protobuf')
+         'xxhash' 'glibmm-2.68' 'rnnoise' 'pipewire' 'libxtst' 'libxrandr' 'jemalloc' 'abseil-cpp'
+         'libdispatch' 'openssl-1.1' 'protobuf')
 makedepends=('cmake' 'git' 'ninja' 'python' 'range-v3' 'tl-expected' 'microsoft-gsl' 'meson'
              'extra-cmake-modules' 'wayland-protocols' 'plasma-wayland-protocols' 'libtg_owt')
 optdepends=('webkit2gtk: embedded browser features'
             'xdg-desktop-portal: desktop integration')
-source=("https://github.com/telegramdesktop/tdesktop/releases/download/v${pkgver}/tdesktop-${pkgver}-full.tar.gz")
-sha512sums=('58a9c5d096e236090347388e1ed480527f841045a80771079dc0c3e35e12ce8ac11753987e87bb57870d9bd8488fc6a4734114648ecec7823d8544744b06c6b1')
+_pkgfn=qtbase-everywhere-src-$_qtver
+source=("https://github.com/telegramdesktop/tdesktop/releases/download/v${pkgver}/tdesktop-${pkgver}-full.tar.gz"
+         https://download.qt.io/official_releases/qt/${_qtver%.*}/$_qtver/submodules/$_pkgfn.tar.xz
+         qt6-base-cflags.patch
+         qt6-base-nostrip.patch
+         https://github.com/desktop-app/patches/archive/9aa30bc44248eb620a720459ef4c81ed0bb65065.tar.gz)
+sha512sums=('58a9c5d096e236090347388e1ed480527f841045a80771079dc0c3e35e12ce8ac11753987e87bb57870d9bd8488fc6a4734114648ecec7823d8544744b06c6b1'
+            'b00cce7bfc29d3a34c9a2f08db147c4bfd962e178916d60033e1845b25eaeaa4fbd42f5c1d7e39453ddb412a4e91c22c8eae52745eda8a47e35a691054d5496e'
+            'ce4c2b4aeb70073c1f68d68e9f03746bba5350e09605ca29f64b57c92d3ff9ab27279fe307307273cb4c23fd091bb9056d7b86eb02a802b695499d56b1f79cf0'
+            'af061bb56d5079d11407e6eb352fa4af7fefa6aed7f8cc40b5b2d591ef7ff04e9da6c6d534ca1904355ea7552951a1610fdcefb04ef9d696cb2b23ad6a0606e8'
+            '5c00d63bab64dda4f1ce85cbfe0a3ffba233dccf835ada3fb3e533cea9442731afdefd99505e95fdea8eed7cf63430e10c9b181c6049afc6c17dbc2dc63d73a5')
 
 prepare() {
-    cd tdesktop-$pkgver-full
+    cd $_pkgfn
+    patch -Np1 -i ../qt6-base-cflags.patch
+    patch -Np1 -i ../qt6-base-nostrip.patch
+    for p in "$srcdir"/patches-*/qtbase_6_4_2/*.patch; do patch -Np1 -i "$p"; done
+    cd ../tdesktop-$pkgver-full
     rm -rf Telegram/ThirdParty/libtgvoip/webrtc_dsp/absl
 }
 
 build() {
+    # Telegram needs a specific and heavily patched version of Qt6 and so we
+    # can't use system dependencies.
+    cmake -B build-qt6-base -S $_pkgfn -G Ninja \
+        -DBUILD_SHARED_LIBS=OFF \
+        -DCMAKE_INSTALL_PREFIX=/usr \
+        -DCMAKE_BUILD_TYPE=None \
+        -DCMAKE_INTERPROCEDURAL_OPTIMIZATION=ON \
+        -DCMAKE_MESSAGE_LOG_LEVEL=STATUS \
+        -DCMAKE_SKIP_RPATH=ON \
+        -DINSTALL_BINDIR=lib/qt6/bin \
+        -DINSTALL_PUBLICBINDIR=usr/bin \
+        -DINSTALL_LIBEXECDIR=lib/qt6 \
+        -DINSTALL_DOCDIR=share/doc/qt6 \
+        -DINSTALL_ARCHDATADIR=lib/qt6 \
+        -DINSTALL_DATADIR=share/qt6 \
+        -DINSTALL_INCLUDEDIR=include/qt6 \
+        -DINSTALL_MKSPECSDIR=lib/qt6/mkspecs \
+        -DINSTALL_EXAMPLESDIR=share/doc/qt6/examples \
+        -DQT_FEATURE_journald=ON \
+        -DQT_FEATURE_openssl_linked=ON \
+        -DQT_FEATURE_system_sqlite=ON \
+        -DQT_FEATURE_system_xcb_xinput=ON
+    cmake --build build-qt6-base
+    DESTDIR=qt6-base cmake --install build-qt6-base
+
     cd tdesktop-$pkgver-full
 
-    #Turns out we're allowed to use the official API key that telegram uses for their snap builds:
+    # Turns out we're allowed to use the official API key that telegram uses for their snap builds:
     # https://github.com/telegramdesktop/tdesktop/blob/8fab9167beb2407c1153930ed03a4badd0c2b59f/snap/snapcraft.yaml#L87-L88
     # Thanks @primeos!
+    export QT_DIR="$srcdir"/qt6-base
     cmake \
         -B build \
         -G Ninja \
         -DCMAKE_INSTALL_PREFIX="/usr" \
-        -DCMAKE_BUILD_TYPE=Release \
+        -DCMAKE_BUILD_TYPE=None \
         -DTDESKTOP_API_ID=611335 \
-        -DTDESKTOP_API_HASH=d524b414d21f4d37f08684c1df41ac9c
+        -DTDESKTOP_API_HASH=d524b414d21f4d37f08684c1df41ac9c \
+        -DCMAKE_INSTALL_RPATH="\$ORIGIN/../lib/$pkgname"
     ninja -C build
 }
 
@@ -43,5 +83,6 @@
     cd tdesktop-$pkgver-full
     DESTDIR="$pkgdir" ninja -C build install
     # They botched the release and put a lot of stuff here.
-    rm -rf "$pkgdir/build"
+    # rm -rf "$pkgdir/build"
+    # install -D ../build-qt6-base/lib/libQt6OpenGL.so.$_qtver "$pkgdir/usr/lib/$pkgname/libQt6OpenGL.so.${_qtver%%.*}"
 }