if CK_TOOLS is undefined, installs in $HOME/CK-TOOLS
if CK_TOOLS is undefined, installs in $HOME/CK-TOOLS

ctuning/ck-env,ctuning/ck-env,ctuning/ck-env,ctuning/ck-env,ctuning/ck-env,ctuning/ck-env,ctuning/ck-env,ctuning/ck-env