I tried to put together a standalone native installer for the latest version of openlane + open_pdks (using https://github.com/conda/constructor/), if anybody is motived to give it a try: feedback is welcome :)

curl -L -O <https://github.com/proppy/conda-eda/releases/download/v0.0-1358-g4ea08b3-40-g8227f29-1-g1007cd2-1-ga1cffe6/openlane-gf180mcuc-0-Linux-x86_64.sh>
bash openlane-gf180mcuc-0-Linux-x86_64.sh -b -p silicon-env/
source silicon-env/bin/activate 
flow.tcl -design inverter

Thanks. Its working fine with Centos7 OS.