quellish/xcode-plugin — comment on commit dfe13ce14d7abc35f1d9c55fd95b5757a46c6378
File:  line 0
By quellish:

I haven't tested it with Build IPA. This change sets CONFIGURATION_BUILD_DIR, if I'm reading the source correctly to make this work with Build IPA wouldn't require major changes. If the xcodeBuildOutput is set, buildDirectory gets set to that, otherwise it would use the existing logic.

http://developer.apple.com/library/mac/#documentation/DeveloperTools/Reference/XcodeBuildSettingRef/1-Build_Setting_Reference/build_setting_ref.html