build-essential git python3-dev python3-pip
python3-setuptools python3-wheel pkg-config tcl-dev
libreadline-dev bison flex libffi-dev ccache python3-venv
- libgmp-dev
+ libgmp-dev libmpfr-dev
- export PATH="/usr/lib/ccache:$PATH"
- export CCACHE_BASEDIR="$PWD"
- export CCACHE_DIR="$PWD/ccache"