centos - How to control ruby-devel presence in a Software Collections environment -

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i'm trying build ruby app on centos 6.6 machine. there different ruby stacks installed through software collections. please not not have root on machine, , privileges limited, particularly, not include package installation.

native extensions not build. seems ruby-devel missing, told admin correctly installed both stacks: 

dnf install rh-ruby22-ruby-devel.x86_64 ruby193-ruby-devel.x86_64 -y

here problem:

bob@server ~> scl enable rh-ruby22 bash bash-4.1$ ruby -v ruby 2.2.2p95 (2015-04-13 revision 50295) [x86_64-linux-gnu]  bash-4.1$ gem install json building native extensions.  take while... error:  error installing json:         error: failed build gem native extension.      /opt/rh/rh-ruby22/root/usr/bin/ruby -r ./siteconf20150625-17536-saskmd.rb extconf.rb mkmf.rb can't find header files ruby @ /opt/rh/rh-ruby22/root/usr/share/include/ruby.h  extconf failed, exit code 1  gem files remain installed in ~/.gem/ruby/gems/json-1.8.3 inspection. results logged ~/.gem/ruby/extensions/x86_64-linux/json-1.8.3/gem_make.out

how can check if ruby-devel (more precisely, rh-ruby22-ruby-devel.x86_64) installed?

what next place search if it's working intended?

this because don't have devel libraries installed sclo ruby version.

sudo yum install rh-ruby22-ruby-devel


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