* automake.in (&variable_dump): Use %var_type properly. (¯o_define): Enforce better overriding rules. Handle the special case that used to handle... (&define_pretty_variable): this. Hence, don't. The variables you define are owned by Automake. (&generate_makefile): PRE_INSTALL and co must not be defined *by the user*. (&variable_defined): Now independent from the owner. (&variable_output, &variable_pretty_output): Adjust to %var_type.