Try to install mysql2 and dependencies only in omnibus installation.

resources/mysql2_gem.rb

@@ -6,13 +6,58 @@
 default_action :install
 
 action :install do
-  include_recipe 'mariadb::devel'
   build_essential 'install_packages'
-  gem_package 'mysql2'
+  package 'cmake' do
+    action :install
+  end
+  if Dir.glob('/opt/chef/embedded/lib/ruby/gems/?.?.?/gems/mysql2-?.?.?/lib/mysql2/mysql2.so').empty?
+
+    #First install curl
+    if Dir.glob('/opt/chef/embedded/lib/libcurl.*.so').empty?
+      remote_file '/tmp/curl-7.59.0.tar.gz' do
+        source 'https://github.com/curl/curl/releases/download/curl-7_59_0/curl-7.59.0.tar.gz'
+        action :create
+      end
+      bash 'extract_curl' do
+        cwd ::File.dirname('/tmp/')
+        code <<-EOH
+          cd /tmp
+          tar xzf /tmp/curl-7.59.0.tar.gz
+          EOH
+      end
+      execute 'configure_and_install_curl' do
+        command 'cd /tmp/curl-7.59.0 && ./configure --prefix=/opt/chef/embedded --disable-manual --disable-debug --enable-optimize --disable-ldap --disable-ldaps --disable-rtsp --enable-proxy --disable-dependency-tracking --enable-ipv6 --without-libidn --without-gnutls --without-librtmp --with-ssl=/opt/chef/embedded --with-zlib=/opt/chef/embedded --with-ca-bundle=/opt/chef/embedded/ssl/certs/cacert.pem && make && make install-exec'
+      end
+    end
+
+    # Then install libmariadb
+    if Dir.glob('/opt/chef/embedded/lib/libmariadb*.so').empty?
+      remote_file '/tmp/mariadb-connector-c-3.0.3.tar.gz' do
+        source 'https://github.com/MariaDB/mariadb-connector-c/archive/v3.0.3.tar.gz'
+        action :create
+      end
+      bash 'extract_libmariadb' do
+        cwd ::File.dirname('/tmp/')
+        code <<-EOH
+          cd /tmp
+          tar xzf /tmp/mariadb-connector-c-3.0.3.tar.gz
+          EOH
+      end
+      execute 'configure_and_install_libmariadb' do
+        command 'cd /tmp/mariadb-connector-c-3.0.3 && cmake -DCMAKE_INSTALL_PREFIX:PATH=/opt/chef/embedded -DCMAKE_INCLUDE_PATH=/opt/chef/embedded/include/ -DCMAKE_LIBRARY_PATH=/opt/chef/embedded/lib/ . && make all install'
+      end
+    end
+
+    # Then finish with mysql2 gem
+    chef_gem 'mysql2' do
+      action :install
+      options '-- --with-mysql-config=/opt/chef/embedded/bin/mariadb_config'
+    end
+  end
 end
 
 action :remove do
-  gem_package 'mysql2' do
+  chef_gem 'mysql2' do
     action :remove
   end
 end