fixed bug reported in https://github.com/ctuning/ck-env/issues/77
fixed bug reported in https://github.com/ctuning/ck-env/issues/77

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