How to compile latest qBittorrent-nox with static qt and boost for Debian Stretch 9.0 (using Debian Stretch 9.0)

build-qbittorrent-static.sh

#!/bin/sh
set -e
apt install -y build-essential git perl python2.7 libboost-all-dev libboost-tools-dev zlib1g-dev autoconf libssl-dev

QBITTORRENT_TAG=v4_2_x
LIBTORRENT_TAG=RC_1_2
QT5_TAG=5.12

rm -rf work
mkdir work
cd work

git clone https://github.com/qt/qtbase.git --branch $QT5_TAG --single-branch --depth 1
cd qtbase
./configure -static -openssl-linked -opensource \
    -confirm-license -c++std 14 -no-opengl -no-dbus -no-widgets -no-gui -no-compile-examples \
    -prefix `pwd`/../qt-qbittorrent
make -j$(nproc)
make install
cd ..

PATH="`pwd`/qt-qbittorrent/bin:$PATH"

git clone https://github.com/qt/qttools.git --branch $QT5_TAG --single-branch --depth 1
cd qttools
qmake
make -j$(nproc)
make install
cd ..

git clone https://github.com/arvidn/libtorrent.git --branch $LIBTORRENT_TAG --single-branch --depth 1
cd libtorrent
b2 link=static variant=release boost-link=static dht=on encryption=on crypto=openssl i2p=on extensions=on
cd ..

git clone https://github.com/qbittorrent/qBittorrent.git --branch $QBITTORRENT_TAG --single-branch --depth 1
cd qBittorrent
QT_QMAKE=`pwd`/../qt-qbittorrent/bin \
    LDFLAGS="-l:libboost_system.a" \
    CXXFLAGS="-std=c++14" \
    libtorrent_CFLAGS="-I`pwd`/../libtorrent/include" \
    libtorrent_LIBS="-L`pwd`/../libtorrent/bin/gcc-6.3.0/release/boost-link-static/crypto-openssl/link-static/threading-multi -l:libtorrent.a" \
    ./configure --disable-gui --disable-qt-dbus
sed -i 's/-lboost_system//' conf.pri
make -j$(nproc)
cd ../..

cp ./work/qBittorrent/src/qbittorrent-nox .

There are several improvements that could be made for this script:

1. The apt install line lacks pkg-config, without it the qBittorrent build command (line 38) will crash on Debian 9.0.1 Live
2. b2 command could be sped up by adding -j$(nproc) to the end of it
3. The size of resulting qbittorrent-nox could be greatly reduced (from 59 to 16 MB) by running strip after building the binary. For example, running strip ./qbittorrent-nox -o ./qbittorrent-nox-stripped will create a stripped binary and keep the old one.