Bash Reference Manual
10.5 Specifying the System Type
There may be some features
configure can not figure out
automatically, but need to determine by the type of host Bash
will run on. Usually
configure can figure that
out, but if it prints a message saying it can not guess the host
type, give it the `--host=TYPE' option. `TYPE' can
either be a short name for the system type, such as `sun4',
or a canonical name with three fields: `CPU-COMPANY-SYSTEM'
See the file `support/config.sub' for the possible
values of each field.