# koji call > Execute an arbitrary XML-RPC call. > Example: a build function declaration is `build(src, target, opts=None, priority=None, channel=None)`. > More information: . - Call build function with scratch option: `koji call build '"{{git+https://src.fedoraproject.org/rpms/vim.git#e847a50297a216229050bf4db3d06a139104e7cf}}"' \"{{target}}\" --kwargs '{"opts":{"scratch": True\}\}'` - Call build function with arch_override option: `koji call build '"{{git+https://src.fedoraproject.org/rpms/vim.git#e847a50297a216229050bf4db3d06a139104e7cf}}"' \"{{target}}\" --kwargs '{"opts":{"arch_override":"sw_64"\}\}'` - Call build function on `default` channel: `koji call build '"{{git+https://src.fedoraproject.org/rpms/vim.git#e847a50297a216229050bf4db3d06a139104e7cf}}"' \"{{target}}\" --kwargs '{"channel":"default"}'` - Display help: `koji call {{[-h|--help]}}`