tce-load -i compiletc cmake curl-dev libssh2-dev clang llvm-dev python3.8

https://static.rust-lang.org/dist/rustc-1.42.0-src.tar.gz

cd rustc-1.42.0-src

cp config.toml
[armv7l-unknown-linux-gnueabihf gcc]
[armv7-unknown-linux-gnueabihf rust]

sudo cp /tmp/tcloop/llvm-dev/usr/local/bin/llvm-config /usr/local/bin

export RUSTFLAGS="$RUSTFLAGS -C link-args=-lffi"
export SSL_CERT_FILE=/usr/local/etc/ssl/certs/ca-certificates.crt
python3 ./x.py build --exclude src/tools/miri [5:12:59]

export LIBSSH2_SYS_USE_PKG_CONFIG=1
DESTDIR=${PWD}/install python3 ./x.py install [0:15:51]
unset LIBSSH2_SYS_USE_PKG_CONFIG

sudo chown -R root:root install
sudo cp -a install/* /

libarena-37ee33db6818b570.so => /usr/lib/libarena-37ee33db6818b570.so (0x00007f6b46743000
or not found...