After entering the option that corresponds to your machine/compiler combination, the configure script should print the message “Configuration successful!” followed by a large amount of configuration information. Depending on your system, you may see a warning message mentioning that some Fortran 2003 features have been removed: this message is normal and can be ignored. However, if you see a message “One of compilers testing failed! Please check your compiler”, configuration has probably failed, and you should make sure you have selected the correct option.
After running the configuration script and choosing a compilation option, a configure.wrf file will be created. Because of the variety of ways that a computer can be configured, if the WRFDA build ultimately fails, there is a chance that minor modifications to the configure.wrf file may be needed.