tce-load -i compiletc meson gtk4-dev gtk4-gir pcre21032-dev.tcz gobject-introspection-dev vala-dev

wget https://download.gnome.org/sources/gtksourceview/5.0/gtksourceview-5.0.0.tar.xz

cd gtksourceview-5.0.0

mkdir build
cd build

CC="gcc -mtune=generic -Os -pipe" CXX="g++ -mtune=generic -Os -pipe -fno-exceptions -fno-rtti" meson --prefix=/usr/local --localstatedir=/var --buildtype=plain

[flto fails]

ninja [0m 32.22s]
sudo ninja install

gtksourceview 5.0.0

    Documentation: NO
    Install tests: NO
    Introspection: YES
    Vala vapi    : YES