I posted this on the Ruby-Talk list with no success. We are trying to install the MySQL gem on RH51 running under zVM. Install MySQL gem as follows: gem install mysql -- --with-mysql-config=/usr/lib/mysql/mysql_config It errors out with cat /mysql-2.5.1/mkmf.log | less cc1: error: unrecognized command line option "-mesa-mzarch" There appears to be a space missing between the -mesa and -mzarch. Can I add the space? and if so where? thank you eric