# How to avoid passwordless ssh

**URL:** <https://community.openpbs.org/t/how-to-avoid-passwordless-ssh/2211>\
**Category:** Users/Site Administrators\
**Created:** [July 21, 2020, 9:00am UTC](https://community.openpbs.org/t/how-to-avoid-passwordless-ssh/2211 "2020-07-21T09:00:47Z")\
**Posts on this page:** 1\
**Showing post:** 3

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**Author:** ![kaox10](https://avatars.discourse-cdn.com/v4/letter/k/d26b3c/32.png) [@kaox10](https://community.openpbs.org/u/kaox10)\
**Post date:** [July 22, 2020, 6:09am UTC](https://community.openpbs.org/t/how-to-avoid-passwordless-ssh/2211/3 "2020-07-22T06:09:32Z")

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Thanks for the reply.

I have downloaded open-mpi 4.0.4 on the website [https://www.open-mpi.org/software/ompi/v4.0/](https://www.open-mpi.org/software/ompi/v4.0/) and tried to build it.

./configure --prefix=/opt/openmpi/4.0.4 --with-tm=/opt/pbs

In the configuration step, I cannot continue. Here is the error message:

— MCA component ess:tm (m4 configuration macro)  
checking for MCA component ess:tm compile mode… static  
checking --with-tm value… not found  
configure: WARNING: Expected file /opt/pbs/include/tm.h not found  
configure: error: Cannot continue

I downloaded rpm file of openpbs 20.0.0 and installed successfully.  
How can I resolve it?

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