# Install Open Nebula On Redhat --error on Gem process
**URL:** https://forum.opennebula.io/t/install-open-nebula-on-redhat-error-on-gem-process/7161
**Category:** Product Support
**Created:** [April 23, 2019, 2:41am UTC](https://forum.opennebula.io/t/install-open-nebula-on-redhat-error-on-gem-process/7161 "2019-04-23T02:41:29Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@michael.fan](https://forum.opennebula.io/u/michael.fan)
#### Post date: [April 23, 2019, 2:41am UTC](https://forum.opennebula.io/t/install-open-nebula-on-redhat-error-on-gem-process/7161/1 "2019-04-23T02:41:29Z")
HI,
I am trying to install OpenNebula on a fresh redhat server.
I receive error on
/usr/share/one/install\_gems
Fetching nokogiri 1.6.8.1
Installing nokogiri 1.6.8.1 with native extensions
Gem::Installer::ExtensionBuildError: ERROR: Failed to build gem native extension.
```
/usr/bin/ruby extconf.rb --use-system-libraries
```
mkmf.rb can’t find header files for ruby at /usr/share/include/ruby.h
Gem files will remain installed in /usr/local/share/gems/gems/nokogiri-1.6.8.1 for inspection.
Results logged to /usr/local/share/gems/gems/nokogiri-1.6.8.1/ext/nokogiri/gem\_make.out
An error occurred while installing nokogiri (1.6.8.1), and Bundler cannot continue.
Make sure that `gem install nokogiri -v '1.6.8.1' --source 'https://rubygems.org/'` succeeds before bundling.
In Gemfile:
azure was resolved to 0.7.10, which depends on
azure-core was resolved to 0.1.14, which depends on
nokogiri
Error installing gems
my system:
uname -r
3.10.0-514.6.1.el7.x86\_64
would anyone help on this case?
Michael
---
### Author:  [@vholer](https://forum.opennebula.io/u/vholer)
#### Post date: [April 23, 2019, 12:39pm UTC](https://forum.opennebula.io/t/install-open-nebula-on-redhat-error-on-gem-process/7161/2 "2019-04-23T12:39:50Z")
Hello @michael.fan,
please check the steps specific to RHEL:
[http://docs.opennebula.org/5.8/deployment/opennebula\_installation/frontend\_installation.html#installing-on-centos-rhel-7](http://docs.opennebula.org/5.8/deployment/opennebula_installation/frontend_installation.html#installing-on-centos-rhel-7)
Most likely you are missing additional RHEL repositories with `ruby-devel` and other packages.
Best regards,
Vlastimil
---
### Author:  [@michael.fan](https://forum.opennebula.io/u/michael.fan)
#### Post date: [April 24, 2019, 3:52am UTC](https://forum.opennebula.io/t/install-open-nebula-on-redhat-error-on-gem-process/7161/3 "2019-04-24T03:52:44Z")
Thanks Vlastimil,
I took you advise and tried on a fresh Centos7.
I strictly follow the instruction,but
during /usr/share/one/install\_gems, I got this:
libss.x86\_64 0:1.42.9-13.el7
libstdc++.x86\_64 0:4.8.5-36.el7\_6.1
mariadb-libs.x86\_64 1:5.5.60-1.el7\_5
nspr.x86\_64 0:4.19.0-1.el7\_5
nss.x86\_64 0:3.36.0-7.1.el7\_6
nss-pem.x86\_64 0:1.0.3-5.el7\_6.1
nss-softokn.x86\_64 0:3.36.0-5.el7\_5
nss-softokn-freebl.x86\_64 0:3.36.0-5.el7\_5
nss-sysinit.x86\_64 0:3.36.0-7.1.el7\_6
nss-tools.x86\_64 0:3.36.0-7.1.el7\_6
nss-util.x86\_64 0:3.36.0-1.1.el7\_6
zlib.x86\_64 0:1.2.7-18.el7
Complete!
Don’t run Bundler as root. Bundler can ask for sudo if it is needed, and
installing your bundle as root will break this application for all non-root
users on this machine.
fips.c(145): OpenSSL internal error, assertion failed: FATAL FIPS SELFTEST FAILURE
Error installing gems
it seems all rpms are installed.
but it follows a warning and an error.
I do not think the warning for running bundler as root results in the error.
the messages: error installing gems seems related with the fips.c(145).
could you help me out on this.
Thanks in advance.
Michael