Bundle install --deployment not working with "gcc: Permission denied"

Bundle install --deployment not working with "gcc: Permission denied"

I've been setting up my server to run a Rails application on it, and
recently started configuring Capistrano for deployment. The deployment
itself seems to be fairly in line, but it fails when it tries to run
bundle install --deployment. Excerpt from the logs:
Gem::Installer::ExtensionBuildError: ERROR: Failed to build gem native
extension.
/usr/local/bin/ruby extconf.rb
creating Makefile
make
compiling crypt_blowfish.c
make: execvp: gcc: Permission denied
make: *** [crypt_blowfish.o] Error 127
Gem files will remain installed in
/home/.../public_html/v4/shared/bundle/ruby/2.0.0/gems/bcrypt-ruby-3.0.1
for inspection.
Results logged to
/home/.../public_html/v4/shared/bundle/ruby/2.0.0/gems/bcrypt-ruby-3.0.1/ext/mri/gem_make.out
An error occurred while installing bcrypt-ruby (3.0.1), and Bundler cannot
continue.
Make sure that `gem install bcrypt-ruby -v '3.0.1'` succeeds before
bundling.
For what it's worth, gem install bcrypt-ruby -v '3.0.1' fails as the
non-root user (even with sudo privileges). It DOES work as the root user.
The gem_make.out log says:
/usr/local/bin/ruby extconf.rb
creating Makefile
make
compiling crypt_blowfish.c
make: execvp: gcc: Permission denied
make: *** [crypt_blowfish.o] Error 127
Permission denied. Which is interesting because I thought that was the
point of using bundle install --deployment. I've looked everywhere and not
found anything that helps.
I had a feeling that it might have to do with the fact that ruby is
installed presumably as the root user. That is -- it was already installed
when I got to the server. I tried to reinstall ruby using RVM (as the
non-root user, though either way I got the same result) and got:
Searching for binary rubies, this might take some time.
Installing requirements for centos, might require sudo password.
Installing required packages: gcc-c++, libyaml-devel,
libffi-devel...................................................................................
Error running 'requirements_centos_libs_install gcc-c++ libyaml-devel
libffi-devel',
please read
/home/.../.rvm/log/ruby-2.0.0-p247/1376056268_package_install_gcc-c++_libyaml-devel_libffi-devel.log
And the log there says...
Transaction Check Error:
package libgcc-4.4.7-3.el6.x86_64 is already installed
package glibc-2.12-1.107.el6_4.2.x86_64 is already installed
package gmp-4.3.1-7.el6_2.2.x86_64 is already installed
package mpfr-2.4.1-6.el6.x86_64 is already installed
package nss-softokn-freebl-3.14.3-3.el6_4.x86_64 is already installed
package libstdc++-4.4.7-3.el6.x86_64 is already installed
package libffi-3.0.5-3.2.el6.x86_64 is already installed
file /sbin/ldconfig from install of glibc-2.12-1.107.el6_4.2.x86_64
conflicts with file from package glibc-2.12-1.107.el6_4.2.i686
file /sbin/sln from install of glibc-2.12-1.107.el6_4.2.x86_64 conflicts
with file from package glibc-2.12-1.107.el6_4.2.i686
file /usr/sbin/iconvconfig from install of
glibc-2.12-1.107.el6_4.2.x86_64 conflicts with file from package
glibc-2.12-1.107.el6_4.2.i686
Long story short I'm sort of at a loss for what to do.
Running CentOS 6.4 / cPanel.
Thanks in advance for any help!