tce-load -i compiletc qt-5.x-dev ffmpeg4-dev frei0r-plugins-dev libexif-dev qt-5.x-webkit-dev cmake jack1-dev

https://github.com/mltframework/shotcut/releases/download/v19.08.16/shotcut-src-190816.txz

cd src/mlt

CC="gcc -flto -fuse-linker-plugin -mtune=generic -Os -pipe" CXX="g++ -flto -fuse-linker-plugin -mtune=generic -Os -pipe -fno-exceptions -fno-rtti" ./configure --prefix=/usr/local --localstatedir=/var --disable-gtk2 --enable-gpl --enable-gpl3

[frei0r-plugins-dev dep ffmpeg3]

find . -name config.mak -type f -exec sed -i 's/-O2//g' {} \;

make [0m 18.60s]
sudo make install

cd src/shotcut/CuteLogger

mkdir build
cd build

cmake -DCMAKE_C_FLAGS="-mtune=generic -Os -pipe" -DCMAKE_CXX_FLAGS="-mtune=generic -Os -pipe" -DCMAKE_INSTALL_PREFIX=/usr/local -DCMAKE_BUILD_TYPE=Release ../

make

cd src/shotcut/src

qmake PREFIX=/usr/local/

make [5m 8.32s]
sudo make install

qmelt

qmake cannot be symlink
cp QWebSettings from qtwebkit-opensource-src-5.9.0

cd /usr/src/src/webvfx

qmake -r PREFIX=/usr/local
sudo make install PREFIX=/usr/local

cd /usr/src/src/webvfx/mlt

qmake -r PREFIX=/usr/local

cd qmelt

qmake -r PREFIX=/usr/local
sudo make install PREFIX=/usr/local