a CentOS 64-bit Server with Ruby 1.8.7 & 1.9.2 {{no RVM, need it without RVM... currently all Ruby1.9.2 binaries are ruby19 and similarly accessible, so no mapping of gem-path or anything of that sort is there}} is giving error while installing gem 'mysql2' ... I have all dependencies installed and all are 64-bit versions ... All error are of kind {./client.h:13: error: redefinition of typedef ‘rb