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

https://ftp.gnome.org/pub/GNOME/sources/librsvg/2.48/librsvg-2.48.8.tar.xz

cd librsvg-2.48.8

edit Cargo.toml
debug = false

CC="gcc -march=armv8-a+crc -mtune=cortex-a72 -Os -pipe" CXX="g++ -march=armv8-a+crc -mtune=cortex-a72 -Os -pipe -fno-exceptions -fno-rtti" ./configure --prefix=/usr/local --disable-static --localstatedir=/var --enable-vala

[lto enabled in Cargo.toml?]

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

make [32m 51.17s]
make install

librsvg-2.48.8

        prefix:                         /usr/local
        C compiler:                     gcc -march=armv8-a+crc -mtune=cortex-a72 -Os -pipe
        rustc:                          rustc 1.42.0

        Cairo version:                  1.17.2
        Pango version:                  1.44.7
        Freetype version:               23.2.17
        Harfbuzz version:               2.6.8

        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