tce-load -i compiletc meson glib2-dev python3.9-dev

wget https://download.gnome.org/sources/gobject-introspection/1.86/gobject-introspection-1.86.0.tar.xz

[from glib-2.86.3/build]
tar xf ../../gobject-introspection-1.86.0.tar.xz

CC="gcc -flto -march=i486 -mtune=i686 -Os -pipe" CXX="g++ -flto -march=i486 -mtune=i686 -Os -pipe -fno-exceptions -fno-rtti" meson setup gobject-introspection-1.86.0 gi-build --prefix=/usr/local --localstatedir=/var --buildtype=plain

ninja -C gi-build [1m 42.19s]
sudo ninja -C gi-build install

meson configure -Dintrospection=enabled
ninja [1m 6.90s]
sudo ninja install

gobject-introspection 1.86.0

  User defined options
    buildtype    : plain
    localstatedir: /var
    prefix       : /usr/local