Ruby on rails on Jailed shell cpanel on centos - ruby-on-rails

Question

I am trying to install ruby on rails on a shared server with Cpanel with Jailed Shell on SSH.
I've this
-jailshell: rbenv: command not found
when server is starting.
After downloading the Ruby tar package, I navigated inside the folder and ran the commands,
make
and
make install
and
./configure --prefix=/usr/local/ruby -exec-prefix=/usr/local/ruby
once and it didn't work
tried even this
./configure --prefix=/usr/local/ -exec-prefix=/usr/local/
the command make install results in the following
Permission denied # dir_s_mkdir - /usr/local/ruby (Errno::EACCES)
from /home/username/ruby-2.1.1/lib/fileutils.rb:247:in `fu_mkdir'
from /home/username/ruby-2.1.1/lib/fileutils.rb:224:in `block (2 levels) in mkdir_p'
from /home/username/ruby-2.1.1/lib/fileutils.rb:222:in `reverse_each'
from /home/username/ruby-2.1.1/lib/fileutils.rb:222:in `block in mkdir_p'
from /home/username/ruby-2.1.1/lib/fileutils.rb:208:in `each'
from /home/username/ruby-2.1.1/lib/fileutils.rb:208:in `mkdir_p'
from ./tool/rbinstall.rb:193:in `makedirs'
from ./tool/rbinstall.rb:300:in `prepare'
from ./tool/rbinstall.rb:339:in `block in <main>'
from ./tool/rbinstall.rb:789:in `call'
from ./tool/rbinstall.rb:789:in `block in <main>'
from ./tool/rbinstall.rb:786:in `each'
from ./tool/rbinstall.rb:786:in `<main>'
make: *** [do-install-all] Error 1
My service provider says it's the max level of access he can give me.
Tried installing it from CPANEL Ruby on rails installation. No luck from there either.
Any workarounds to install ruby, rvm and rails?
Thanks.
P.S. Tried a lot of methods posted online, no luck.