public Builder clearRequiredTech() {
        if (requiredTechBuilder_ == null) {
          requiredTech_ = org.bwapi.proxy.messages.GameMessages.TechType.getDefaultInstance();
          onChanged();
        } else {
          requiredTechBuilder_.clear();
        }
        bitField0_ = (bitField0_ & ~0x00000080);
        return this;
      }