tce-load -i compiletc rust gtk3-dev gtk3-gir gobject-introspection-dev vala-dev perl5 libcroco-dev

wget https://ftp.gnome.org/pub/GNOME/sources/librsvg/2.46/librsvg-2.46.3.tar.xz

cd librsvg-2.46.3

edit Cargo.toml
debug = false

CC="gcc -march=i486 -mtune=i686 -Os -pipe" CXX="g++ -march=i486 -mtune=i686 -Os -pipe -fno-exceptions -fno-rtti" ./configure --prefix=/usr/local --disable-static --localstatedir=/var --enable-vala

configure: error: librsvg-2.48.x needs at rustc version at least 1.39

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

make [16m 0.46s]
make install

librsvg 8.9mb vs previous 185kb

librsvg-2.46.3

        prefix:                         /usr/local
        C compiler:                     gcc -march=i486 -mtune=i686 -Os -pipe
        rustc:                          rustc 1.37.0

        Debugging information for Rust: no

        Build introspectable bindings:  yes
        Build Vala bindings:            yes
        Build GdkPixbuf loader:         yes
        Build miscellaneous tools:      yes
        Build HTML documentation:       no