diff --git a/Telegram/build/docker/centos_env/Dockerfile b/Telegram/build/docker/centos_env/Dockerfile
new file mode 100644
index 000000000..c02e0d331
--- /dev/null
+++ b/Telegram/build/docker/centos_env/Dockerfile
@@ -0,0 +1,466 @@
+FROM centos:7 AS builder
+
+ENV GIT https://github.com
+ENV PKG_CONFIG_PATH /usr/local/lib/pkgconfig
+ENV QT 5_12_8
+ENV QT_PREFIX /usr/local/desktop-app/Qt-5.12.8
+ENV OPENSSL_VER 1_1_1
+ENV OPENSSL_PREFIX /usr/local/desktop-app/openssl-1.1.1
+
+RUN yum -y install https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm
+RUN yum -y install centos-release-scl
+
+RUN yum -y install git cmake3 zlib-devel gtk2-devel libICE-devel \
+	libSM-devel libdrm-devel autoconf automake libtool fontconfig-devel \
+	freetype-devel libX11-devel at-spi2-core-devel alsa-lib-devel \
+	pulseaudio-libs-devel mesa-libGL-devel mesa-libEGL-devel \
+	pkgconfig bison yasm file which xorg-x11-util-macros \
+	devtoolset-8-make devtoolset-8-gcc devtoolset-8-gcc-c++ \
+	devtoolset-8-binutils
+
+RUN ln -s cmake3 /usr/bin/cmake
+
+ENV LibrariesPath /usr/src/Libraries
+WORKDIR $LibrariesPath
+
+FROM builder AS patches
+RUN git clone $GIT/desktop-app/patches.git
+RUN cd patches && git checkout b00f25d
+
+FROM builder AS libffi
+RUN git clone -b v3.3 --depth=1 $GIT/libffi/libffi.git
+
+WORKDIR libffi
+RUN scl enable devtoolset-8 -- ./autogen.sh
+RUN scl enable devtoolset-8 -- ./configure --enable-static --disable-docs
+RUN scl enable devtoolset-8 -- make -j$(nproc)
+RUN scl enable devtoolset-8 -- make DESTDIR="$LibrariesPath/libffi-cache" install
+
+WORKDIR ..
+RUN rm -rf libffi
+
+FROM builder AS xz
+RUN git clone -b v5.2.5 https://git.tukaani.org/xz.git
+
+WORKDIR xz
+RUN scl enable devtoolset-8 -- cmake3 -B build . -DCMAKE_BUILD_TYPE=Release
+RUN scl enable devtoolset-8 -- cmake3 --build build -j$(nproc)
+RUN DESTDIR="$LibrariesPath/xz-cache" scl enable devtoolset-8 -- cmake3 --install build
+
+FROM builder AS opus
+RUN git clone -b v1.3 --depth=1 $GIT/xiph/opus.git
+
+WORKDIR opus
+RUN scl enable devtoolset-8 -- ./autogen.sh
+RUN scl enable devtoolset-8 -- ./configure
+RUN scl enable devtoolset-8 -- make -j$(nproc)
+RUN scl enable devtoolset-8 -- make DESTDIR="$LibrariesPath/opus-cache" install
+
+WORKDIR ..
+RUN rm -rf opus
+
+FROM builder AS xcb-proto
+RUN git clone -b xcb-proto-1.14 --depth=1 https://gitlab.freedesktop.org/xorg/proto/xcbproto.git
+
+WORKDIR xcbproto
+RUN scl enable devtoolset-8 -- ./autogen.sh --enable-static
+RUN scl enable devtoolset-8 -- make -j$(nproc)
+RUN scl enable devtoolset-8 -- make DESTDIR="$LibrariesPath/xcb-proto-cache" install
+
+WORKDIR ..
+RUN rm -rf xcbproto
+
+FROM builder AS xcb
+COPY --from=xcb-proto ${LibrariesPath}/xcb-proto-cache /
+
+RUN git clone -b libxcb-1.14 --depth=1 https://gitlab.freedesktop.org/xorg/lib/libxcb.git
+
+WORKDIR libxcb
+RUN scl enable devtoolset-8 -- ./autogen.sh --enable-static
+RUN scl enable devtoolset-8 -- make -j$(nproc)
+RUN scl enable devtoolset-8 -- make DESTDIR="$LibrariesPath/xcb-cache" install
+
+WORKDIR ..
+RUN rm -rf libxcb
+
+FROM builder AS libXext
+RUN git clone -b libXext-1.3.4 --depth=1 https://gitlab.freedesktop.org/xorg/lib/libxext.git
+
+WORKDIR libxext
+RUN scl enable devtoolset-8 -- ./autogen.sh --enable-static
+RUN scl enable devtoolset-8 -- make -j$(nproc)
+RUN scl enable devtoolset-8 -- make DESTDIR="$LibrariesPath/libXext-cache" install
+
+WORKDIR ..
+RUN rm -rf libxext
+
+FROM builder AS libXfixes
+RUN git clone -b libXfixes-5.0.3 --depth=1 https://gitlab.freedesktop.org/xorg/lib/libxfixes.git
+
+WORKDIR libxfixes
+RUN scl enable devtoolset-8 -- ./autogen.sh --enable-static
+RUN scl enable devtoolset-8 -- make -j$(nproc)
+RUN scl enable devtoolset-8 -- make DESTDIR="$LibrariesPath/libXfixes-cache" install
+
+WORKDIR ..
+RUN rm -rf libxfixes
+
+FROM builder AS libXi
+RUN git clone -b libXi-1.7.10 --depth=1 https://gitlab.freedesktop.org/xorg/lib/libxi.git
+
+WORKDIR libxi
+RUN scl enable devtoolset-8 -- ./autogen.sh --enable-static
+RUN scl enable devtoolset-8 -- make -j$(nproc)
+RUN scl enable devtoolset-8 -- make DESTDIR="$LibrariesPath/libXi-cache" install
+
+WORKDIR ..
+RUN rm -rf libxi
+
+FROM builder AS libXrender
+RUN git clone -b libXrender-0.9.10 --depth=1 https://gitlab.freedesktop.org/xorg/lib/libxrender.git
+
+WORKDIR libxrender
+RUN scl enable devtoolset-8 -- ./autogen.sh --enable-static
+RUN scl enable devtoolset-8 -- make -j$(nproc)
+RUN scl enable devtoolset-8 -- make DESTDIR="$LibrariesPath/libXrender-cache" install
+
+WORKDIR ..
+RUN rm -rf libxrender
+
+FROM builder AS wayland
+COPY --from=libffi ${LibrariesPath}/libffi-cache /
+
+RUN git clone -b 1.18.0 --depth=1 https://gitlab.freedesktop.org/wayland/wayland.git
+
+WORKDIR wayland
+RUN scl enable devtoolset-8 -- ./autogen.sh \
+	--enable-static \
+	--disable-documentation \
+	--disable-dtd-validation
+
+RUN scl enable devtoolset-8 -- make -j$(nproc)
+RUN scl enable devtoolset-8 -- make DESTDIR="$LibrariesPath/wayland-cache" install
+
+WORKDIR ..
+RUN rm -rf wayland
+
+FROM builder AS libva
+
+COPY --from=libffi ${LibrariesPath}/libffi-cache /
+COPY --from=libXext ${LibrariesPath}/libXext-cache /
+COPY --from=libXfixes ${LibrariesPath}/libXfixes-cache /
+COPY --from=wayland ${LibrariesPath}/wayland-cache /
+
+RUN git clone -b 2.9.0 --depth=1 $GIT/intel/libva.git
+
+WORKDIR libva
+RUN scl enable devtoolset-8 -- ./autogen.sh --enable-static
+RUN scl enable devtoolset-8 -- make -j$(nproc)
+RUN scl enable devtoolset-8 -- make DESTDIR="$LibrariesPath/libva-cache" install
+
+WORKDIR ..
+RUN rm -rf libva
+
+FROM builder AS libvdpau
+RUN git clone -b libvdpau-1.2 --depth=1 https://gitlab.freedesktop.org/vdpau/libvdpau.git
+
+WORKDIR libvdpau
+RUN scl enable devtoolset-8 -- ./autogen.sh --enable-static
+RUN scl enable devtoolset-8 -- make -j$(nproc)
+RUN scl enable devtoolset-8 -- make DESTDIR="$LibrariesPath/libvdpau-cache" install
+
+WORKDIR ..
+RUN rm -rf libvdpau
+
+FROM builder AS ffmpeg
+
+COPY --from=opus ${LibrariesPath}/opus-cache /
+COPY --from=libva ${LibrariesPath}/libva-cache /
+COPY --from=libvdpau ${LibrariesPath}/libvdpau-cache /
+
+RUN git clone -b release/3.4 --depth=1 $GIT/FFmpeg/FFmpeg.git ffmpeg
+
+WORKDIR ffmpeg
+RUN scl enable devtoolset-8 -- ./configure \
+	--disable-debug \
+	--disable-programs \
+	--disable-doc \
+	--disable-network \
+	--disable-autodetect \
+	--disable-everything \
+	--disable-alsa \
+	--disable-iconv \
+	--enable-libopus \
+	--enable-vaapi \
+	--enable-vdpau \
+	--enable-protocol=file \
+	--enable-hwaccel=h264_vaapi \
+	--enable-hwaccel=h264_vdpau \
+	--enable-hwaccel=mpeg4_vaapi \
+	--enable-hwaccel=mpeg4_vdpau \
+	--enable-decoder=aac \
+	--enable-decoder=aac_fixed \
+	--enable-decoder=aac_latm \
+	--enable-decoder=aasc \
+	--enable-decoder=alac \
+	--enable-decoder=flac \
+	--enable-decoder=gif \
+	--enable-decoder=h264 \
+	--enable-decoder=h264_vdpau \
+	--enable-decoder=hevc \
+	--enable-decoder=mp1 \
+	--enable-decoder=mp1float \
+	--enable-decoder=mp2 \
+	--enable-decoder=mp2float \
+	--enable-decoder=mp3 \
+	--enable-decoder=mp3adu \
+	--enable-decoder=mp3adufloat \
+	--enable-decoder=mp3float \
+	--enable-decoder=mp3on4 \
+	--enable-decoder=mp3on4float \
+	--enable-decoder=mpeg4 \
+	--enable-decoder=mpeg4_vdpau \
+	--enable-decoder=msmpeg4v2 \
+	--enable-decoder=msmpeg4v3 \
+	--enable-decoder=opus \
+	--enable-decoder=pcm_alaw \
+	--enable-decoder=pcm_f32be \
+	--enable-decoder=pcm_f32le \
+	--enable-decoder=pcm_f64be \
+	--enable-decoder=pcm_f64le \
+	--enable-decoder=pcm_lxf \
+	--enable-decoder=pcm_mulaw \
+	--enable-decoder=pcm_s16be \
+	--enable-decoder=pcm_s16be_planar \
+	--enable-decoder=pcm_s16le \
+	--enable-decoder=pcm_s16le_planar \
+	--enable-decoder=pcm_s24be \
+	--enable-decoder=pcm_s24daud \
+	--enable-decoder=pcm_s24le \
+	--enable-decoder=pcm_s24le_planar \
+	--enable-decoder=pcm_s32be \
+	--enable-decoder=pcm_s32le \
+	--enable-decoder=pcm_s32le_planar \
+	--enable-decoder=pcm_s64be \
+	--enable-decoder=pcm_s64le \
+	--enable-decoder=pcm_s8 \
+	--enable-decoder=pcm_s8_planar \
+	--enable-decoder=pcm_u16be \
+	--enable-decoder=pcm_u16le \
+	--enable-decoder=pcm_u24be \
+	--enable-decoder=pcm_u24le \
+	--enable-decoder=pcm_u32be \
+	--enable-decoder=pcm_u32le \
+	--enable-decoder=pcm_u8 \
+	--enable-decoder=pcm_zork \
+	--enable-decoder=vorbis \
+	--enable-decoder=wavpack \
+	--enable-decoder=wmalossless \
+	--enable-decoder=wmapro \
+	--enable-decoder=wmav1 \
+	--enable-decoder=wmav2 \
+	--enable-decoder=wmavoice \
+	--enable-encoder=libopus \
+	--enable-parser=aac \
+	--enable-parser=aac_latm \
+	--enable-parser=flac \
+	--enable-parser=h264 \
+	--enable-parser=hevc \
+	--enable-parser=mpeg4video \
+	--enable-parser=mpegaudio \
+	--enable-parser=opus \
+	--enable-parser=vorbis \
+	--enable-demuxer=aac \
+	--enable-demuxer=flac \
+	--enable-demuxer=gif \
+	--enable-demuxer=h264 \
+	--enable-demuxer=hevc \
+	--enable-demuxer=m4v \
+	--enable-demuxer=mov \
+	--enable-demuxer=mp3 \
+	--enable-demuxer=ogg \
+	--enable-demuxer=wav \
+	--enable-muxer=ogg \
+	--enable-muxer=opus
+
+RUN scl enable devtoolset-8 -- make -j$(nproc)
+RUN scl enable devtoolset-8 -- make DESTDIR="$LibrariesPath/ffmpeg-cache" install
+
+FROM builder AS openal
+RUN git clone -b openal-soft-1.20.1 --depth=1 $GIT/kcat/openal-soft.git
+
+WORKDIR openal-soft
+RUN scl enable devtoolset-8 -- cmake3 -B build . \
+	-DCMAKE_BUILD_TYPE=Release \
+	-DLIBTYPE:STRING=STATIC \
+	-DALSOFT_EXAMPLES=OFF \
+	-DALSOFT_TESTS=OFF \
+	-DALSOFT_UTILS=OFF \
+	-DALSOFT_CONFIG=OFF
+
+RUN scl enable devtoolset-8 -- cmake3 --build build -j$(nproc)
+RUN DESTDIR="$LibrariesPath/openal-cache" scl enable devtoolset-8 -- cmake3 --install build
+
+WORKDIR ..
+RUN rm -rf openal
+
+FROM builder AS openssl
+ENV opensslDir openssl_${OPENSSL_VER}
+RUN git clone -b OpenSSL_${OPENSSL_VER}-stable --depth=1 \
+	$GIT/openssl/openssl.git $opensslDir
+
+WORKDIR ${opensslDir}
+RUN scl enable devtoolset-8 -- ./config --prefix="$OPENSSL_PREFIX" no-tests
+RUN scl enable devtoolset-8 -- make -j$(nproc)
+RUN scl enable devtoolset-8 -- make DESTDIR="$LibrariesPath/openssl-cache" install_sw
+
+WORKDIR ..
+RUN rm -rf $opensslDir
+
+FROM builder AS xkbcommon
+RUN git clone -b xkbcommon-0.8.4 --depth=1 $GIT/xkbcommon/libxkbcommon.git
+
+WORKDIR libxkbcommon
+RUN scl enable devtoolset-8 -- ./autogen.sh \
+	--disable-docs \
+	--disable-wayland \
+	--with-xkb-config-root=/usr/share/X11/xkb \
+	--with-x-locale-root=/usr/share/X11/locale
+
+RUN scl enable devtoolset-8 -- make -j$(nproc)
+RUN scl enable devtoolset-8 -- make DESTDIR="$LibrariesPath/xkbcommon-cache" install
+
+WORKDIR ..
+RUN rm -rf libxkbcommon
+
+FROM patches AS qt
+
+COPY --from=libffi ${LibrariesPath}/libffi-cache /
+COPY --from=xcb ${LibrariesPath}/xcb-cache /
+COPY --from=libXext ${LibrariesPath}/libXext-cache /
+COPY --from=libXfixes ${LibrariesPath}/libXfixes-cache /
+COPY --from=libXi ${LibrariesPath}/libXi-cache /
+COPY --from=libXrender ${LibrariesPath}/libXrender-cache /
+COPY --from=wayland ${LibrariesPath}/wayland-cache /
+COPY --from=openssl ${LibrariesPath}/openssl-cache /
+COPY --from=xkbcommon ${LibrariesPath}/xkbcommon-cache /
+
+RUN git clone -b v5.12.8 --depth=1 git://code.qt.io/qt/qt5.git qt_${QT}
+WORKDIR qt_${QT}
+RUN perl init-repository --module-subset=qtbase,qtwayland,qtimageformats,qtsvg
+RUN git submodule update qtbase qtwayland qtimageformats qtsvg
+
+WORKDIR qtbase
+RUN find ../../patches/qtbase_${QT} -type f -print0 | sort -z | xargs -r0 git apply
+WORKDIR ../qtwayland
+RUN find ../../patches/qtwayland_${QT} -type f -print0 | sort -z | xargs -r0 git apply
+WORKDIR ..
+
+RUN scl enable devtoolset-8 -- ./configure -prefix "$QT_PREFIX" \
+	-release \
+	-opensource \
+	-confirm-license \
+	-qt-libpng \
+	-qt-libjpeg \
+	-qt-harfbuzz \
+	-qt-pcre \
+	-qt-xcb \
+	-no-icu \
+	-no-gtk \
+	-static \
+	-dbus-runtime \
+	-openssl-linked \
+	-I "$OPENSSL_PREFIX/include" OPENSSL_LIBS="$OPENSSL_PREFIX/lib/libssl.a $OPENSSL_PREFIX/lib/libcrypto.a -lz -ldl -lpthread" \
+	-nomake examples \
+	-nomake tests
+
+RUN scl enable devtoolset-8 -- make -j$(nproc)
+RUN scl enable devtoolset-8 -- make INSTALL_ROOT="$LibrariesPath/qt-cache" install
+
+FROM patches AS breakpad
+RUN git clone https://chromium.googlesource.com/breakpad/breakpad.git
+
+WORKDIR breakpad
+RUN git checkout bc8fb886
+RUN git clone https://chromium.googlesource.com/linux-syscall-support.git src/third_party/lss
+
+WORKDIR src/third_party/lss
+RUN git checkout a91633d1
+WORKDIR ${LibrariesPath}
+
+ENV BreakpadCache ${LibrariesPath}/breakpad-cache
+RUN git clone https://chromium.googlesource.com/external/gyp.git
+
+WORKDIR gyp
+RUN git checkout 9f2a7bb1
+RUN git apply ../patches/gyp.diff
+
+WORKDIR ../breakpad
+RUN scl enable devtoolset-8 -- ./configure
+RUN scl enable devtoolset-8 -- make -j$(nproc)
+RUN scl enable devtoolset-8 -- make DESTDIR="$BreakpadCache" install
+
+WORKDIR src
+RUN rm -rf testing
+RUN git clone $GIT/google/googletest.git testing
+
+WORKDIR tools
+RUN sed -i 's/minidump_upload.m/minidump_upload.cc/' linux/tools_linux.gypi
+RUN ../../../gyp/gyp  --depth=. --generator-output=.. -Goutput_dir=../out tools.gyp --format=cmake
+
+WORKDIR ../../out/Default
+RUN scl enable devtoolset-8 -- cmake3 .
+RUN scl enable devtoolset-8 -- cmake3 --build . --target dump_syms -j$(nproc)
+RUN mv dump_syms $BreakpadCache
+
+WORKDIR ..
+RUN rm -rf gyp
+
+FROM builder AS webrtc
+
+COPY --from=opus ${LibrariesPath}/opus-cache /
+COPY --from=ffmpeg ${LibrariesPath}/ffmpeg-cache /
+COPY --from=openssl ${LibrariesPath}/openssl-cache /
+COPY --from=qt ${LibrariesPath}/qt_${QT} qt_${QT}
+
+RUN git clone $GIT/desktop-app/tg_owt.git
+
+WORKDIR tg_owt
+RUN git checkout c73a471
+
+RUN scl enable devtoolset-8 -- cmake3 -B out/Release . \
+	-DCMAKE_BUILD_TYPE=Release \
+	-DTG_OWT_SPECIAL_TARGET=linux \
+	-DTG_OWT_LIBJPEG_INCLUDE_PATH=$(pwd)/../qt_$QT/qtbase/src/3rdparty/libjpeg \
+	-DTG_OWT_OPENSSL_INCLUDE_PATH=$OPENSSL_PREFIX/include \
+	-DTG_OWT_OPUS_INCLUDE_PATH=/usr/local/include/opus \
+	-DTG_OWT_FFMPEG_INCLUDE_PATH=/usr/local/include
+
+RUN scl enable devtoolset-8 -- cmake3 --build out/Release
+
+FROM builder
+
+COPY --from=libffi ${LibrariesPath}/libffi-cache /
+COPY --from=xz ${LibrariesPath}/xz-cache /
+COPY --from=opus ${LibrariesPath}/opus-cache /
+COPY --from=xcb ${LibrariesPath}/xcb-cache /
+COPY --from=libXext ${LibrariesPath}/libXext-cache /
+COPY --from=libXfixes ${LibrariesPath}/libXfixes-cache /
+COPY --from=libXi ${LibrariesPath}/libXi-cache /
+COPY --from=libXrender ${LibrariesPath}/libXrender-cache /
+COPY --from=wayland ${LibrariesPath}/wayland-cache /
+COPY --from=libva ${LibrariesPath}/libva-cache /
+COPY --from=libvdpau ${LibrariesPath}/libvdpau-cache /
+COPY --from=ffmpeg ${LibrariesPath}/ffmpeg ffmpeg
+COPY --from=ffmpeg ${LibrariesPath}/ffmpeg-cache /
+COPY --from=openal ${LibrariesPath}/openal-cache /
+COPY --from=openssl ${LibrariesPath}/openssl-cache /
+COPY --from=xkbcommon ${LibrariesPath}/xkbcommon-cache /
+COPY --from=qt ${LibrariesPath}/qt-cache /
+COPY --from=breakpad ${LibrariesPath}/breakpad breakpad
+COPY --from=breakpad ${LibrariesPath}/breakpad-cache /
+COPY --from=webrtc ${LibrariesPath}/tg_owt tg_owt
+
+WORKDIR ../tdesktop
+VOLUME [ "/usr/src/tdesktop" ]
+CMD [ "/usr/src/tdesktop/Telegram/build/docker/centos_env/build.sh" ]
diff --git a/Telegram/build/docker/centos_env/build.sh b/Telegram/build/docker/centos_env/build.sh
new file mode 100644
index 000000000..9bac991f4
--- /dev/null
+++ b/Telegram/build/docker/centos_env/build.sh
@@ -0,0 +1,10 @@
+#!/bin/bash
+
+cd Telegram
+scl enable devtoolset-8 -- ./configure.sh "$@"
+
+if [ -n "$DEBUG" ]; then
+	scl enable devtoolset-8 -- cmake3 --build ../out/Debug -j$(nproc)
+else
+	scl enable devtoolset-8 -- cmake3 --build ../out/Release -j$(nproc)
+fi