No ruby-devel in RHEL7?

I have a recently installed RHEL7 system, and need to do gem install jekyll, however this fails as:

Fetching: yajl-ruby-1.2.1.gem (100%)
Building native extensions. This could take a while...
ERROR: Error installing jekyll:
ERROR: Failed to build gem native extension.

/usr/bin/ruby extconf.rb
mkmf.rb can't find header files for ruby at /usr/share/include/ruby.h

Google suggest this is due to the lack of a ruby-devel package being installed. However there doesn't seem to *be* such a package in RHEL7. Do I need to move to a software collection (don't really want to do this as this will be for a production machine, not development) or can I get it some other way?

You need to subscribe to the _optional_ repo to get all the devel packages.

subscription-manager repos --enable rhel-7-server-optional-rpms

This is because the `ruby-devel` package is contained in the `rhel-7-server-optional-rpms` repository.

I had the same issue and ended up downloading the package from:

[

[To see links please register here]

][1]

In RHEL7.5, this package can be installed with:

rpm -ivh ruby-devel-2.0.0.648-33.el7_4.x86_64.rpm

Also, the development tools can be installed before that using:

yum groupinstall "Development Tools"

[1]:

[To see links please register here]

You can download from:

[To see links please register here]

Something like this would work:

wget

[To see links please register here]

rpm -ivh ruby-devel-2.0.0.598-25.el7_1.x86_64.rpm

This answer comes by way of piecing together bits from other answers - so to the previous contributors...thank you because I would not have figured this out.

This example is based on the RHEL 7 AMI (Amazon Managed Image) 3.10.0-229.el7.x86_64.

So by default as mentioned above the `optional` repository is not enabled. Don't add another repo.d file as it already exists just that it is disabled.

1. To enable first you need the name. I used grep to do this:

grep -B1 -i optional /etc/yum.repos.d/*

above each name will be the repo id enclosed in `[ ]` look for the optional **not** `optional-source`

2. Enable the optional repo:

yum-config-manager --enable <repo-id>

3. Refresh the yum cache (not sure if this is necessary but it doesn't hurt):

sudo yum makecache

4. Finally, you can install `ruby-devel`:

yum install ruby-devel


Depending on your user's permissions you may need to use `sudo`.

ruby-devel RPM is available in the following repo on RHEL 7

rhel-7-server-optional-beta-rpms

Set "enabled = 1" for this repo in your .repo file and then run

`yum install ruby-devel`

additional repos are available to your RHEL 7

# yum -y install yum-utils
# yum repolist all

This will list all available repos. Enable the repo you need. The devel packages are in extras for instance:

# yum-config-manager --enable rhui-REGION-rhel-server-extras

After performing these steps, I could then install ruby-devel, augeas-devel and install/compile

# gem install ruby-augeas

At least on Oracle Linux 7 you have to enable an additional repo.

[root@foo ~]# yum repolist
repo id repo name
[...]
ol7_optional_latest/x86_64 Oracle Linux 7Server Optional Latest (x86_64)

After enabling the repo `ruby-devel` sits there, awaiting your installation.

[root@foo ~]# yum info ruby-devel | egrep 'Name|Version|From'
Name : ruby-devel
Version : 2.0.0.598
From repo : ol7_optional_latest

That's all.

Install ruby package on your system and try again.

sudo yum install ruby193-ruby-devel.x86_64